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Table Of Contents
Numbering Plans and Dialing Procedures
E.164 Dialing Plan Implementation
Directory Services (411, 555-1212, 0+ Listing Services)
Information Service Calls (900 and 976)
n11 support (211, 311, 411, 611, 711, 811)
Community Information and Referral Services (211)
Telecommunications Relay Services (711)
Busy Line Verification (BLV) and Operator Interrupt (OI) Services
Calling Party Number Options for Outgoing SETUP Messages
Dialing Parity (IntraLATA Toll Presubscription)
General Description of Lawful Intercept Implementation
Lawful Intercept Provisioning Interface
Lawful Intercept Call Data Interface
Lawful Intercept Call Content Function
Local Number Portability (LNP)
Network Loopback Test for NCS/MGCP Subscriber Endpoints
Near End Test Origination Test Calls
Network Features
Revised: March 19, 2007, OL-5906-14The Cisco BTS 10200 Softswitch supports network features as described in the following sections:
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Numbering Plans and Dialing Procedures
In general, Cisco BTS 10200 Softswitch features delivered via gateway clients behave identically to their public switched telephone network (PSTN) counterparts.
Note
see "Class of Service Restrictions and Outgoing Call Barring."Some features can be accessed and controlled by the subscriber using a handset and vertical service codes (VSCs). VSCs are provisionable by the service provider (any unique ASCII string up to five characters long), and the customary values are country specific. The VSC values used throughout this chapter are for illustration purposes. For convenience, some VSC values are preprovisioned in the Cisco BTS 10200 Softswitch. (These values are listed in the Vertical Service Code appendix of the Cisco BTS 10200 Softswitch Command Line Interface Reference Guide.)
Typically, the system responds to user handset actions by providing an appropriate announcement. However, if an announcement is not provisioned or cannot be played, an alternate tone (for example, reorder tone) is played. Announcements are listed in the Cisco BTS 10200 Softswitch Provisioning Guide, and tones are listed in the Cisco BTS 10200 Softswitch Operations, Maintenance, and Troubleshooting Guide.
Digit Manipulation
The Digit Manipulation (DIGMAN) feature provides the ability to modify both calling number and called number for both incoming and outgoing calls within the Cisco BTS 10200 Softswitch.
Note
In addition to modifying the calling number and the called number, the digit manipulation tables can be used to modify the nature of address (NOA) of ANI and/or DNIS numbers. This feature provides the following benefits in the service provider network:
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For additional standards information, see the following industry sources:
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The Cisco BTS 10200 Softswitch performs digit manipulation by matching and replacing digits in the digit string that is being processed. For details on the rules used in this process, see the Cisco BTS 10200 Softswitch Operations, Maintenance, and Troubleshooting Guide.
Numbering Plans and Dialing Procedures
The Cisco BTS 10200 Softswitch supports the numbering plans and dialing procedures listed in Table 3-1. These features are described in the sections that follow.
Table 3-1 Support for Numbering Plans and Dialing Procedures
ITU-T Recommendation E.164
GR-532-CORE
FSD-30-17-0000GR-2892-CORE
SR-2275, Sec. 3.3GR-532-CORE
FSD-30-16-0000
E.164 Dialing Plan Implementation
The Cisco BTS 10200 Softswitch implements a dialing plan based on ITU-T Recommendation E.164, The International Public Telecommunication Numbering Plan, a standard for numbering and routing. This dialing plan uses a generic numbering scheme for number evaluation. The Cisco BTS 10200 Softswitch performs digit manipulation on ANI data of the calling party, and on DNIS data of the called party.
National Number
In the E.164 numbering scheme, there are three parts to any national number (number that terminates within the country):
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Note
The combination [NDC + EC + DN], or [NDC + SN], is called the national number (NN).
Tip
A user originates a call by dialing as follows:
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Examples of national prefixes include:
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International Number
The international number is the number dialed from one country to another to reach a subscriber. Each country is assigned a country code (CC). The international number is the combination [CC + NN], or [CC + NCD + EC + DN]. Table 3-2 lists several examples.
To place a call to a phone in another country, the caller must dial an international prefix and then the international number. Thus, the complete digit string to dial is [international prefix + CC + NN]. The international prefix varies from country to country. Examples of international prefixes include:
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Example of a call from China to Montreal: 00-1-514-870-xxxx
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Example of a call from the United States to Bruxelles: 011-32-02-123-xxxx
In some countries, two or more international prefixes may be used
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Casual Dialing (Dial Around)
Casual dialing, also known as dial around, specifies whether the carrier supports 101XXXX calls. The digit map CLI command tokens provide the digit pattern. The digit pattern specifies all possible acceptable patterns. An example of a casual digit pattern is 1010321 or 1010220. The digit map table tells the media gateway (MGW) how to collect and report dialed digits to the Call Agent (CA). Subscribers can prefix their interLATA or international calls with 101XXXX. Casual dialing supports the following casual calls:
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Directory Services (411, 555-1212, 0+ Listing Services)
The Cisco BTS 10200 Softswitch supports the directory services access feature as specified in Telcordia document GR-352-CORE, LSSGR: Interface To Directory Assistance Systems (FSD 30-17-0000).
Directory services allows a subscriber to obtain the listed telephone number for a given name and address. The caller dials a specific service number to reach directory services, also referred to as directory assistance (DA). When a subscriber dials one of the following digit patterns, the Cisco BTS 10200 Softswitch routes the call to the applicable directory services in the PSTN:
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The service to the caller can be provided manually by a live operator, automated via a voice or dual tone multifrequency (DTMF) recognition system, or by a combination of these. The volume level from an automated voice-response unit, however, should be comparable to that of a live operator. Different network operators can employ different systems in providing directory services.
A typical directory services request requires that the caller first give the name of the town and city. The caller then provides the name of the person or business that the caller wants to call, including the spelling of unusual names. Finally, the caller states if the request is for residence or business. Additional services include handling multiple requests made during the same call and automatic connection to the person (or business) the caller wants to call.
Easily Recognizable Codes
The Cisco BTS 10200 Softswitch supports selected easily recognizable codes (ERCs) as described in document SR-2275, Telcordia Notes On the Network, Section 3.3. The supported ERCs are
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Other Telcordia reference documents include:
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Information Service Calls (900 and 976)
Information service calls (ISCs) provide a variety of announcement-related services on a national or local basis. There are two general categories of this service:
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National calls are dialed as 1-900-xxx-xxxx and local calls are dialed as NPA-976-xxxx.
n11 support (211, 311, 411, 611, 711, 811)
Note
This section describes Cisco BTS 10200 Softswitch support for n11 services. The typical relationship between the n11 codes and the nature of dial (NOD) values is as follows. The NOD values are listed in the Cisco BTS 10200 Softswitch Command Line Reference Guide.
For additional information on n11 calling, see the following industry documents:
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Community Information and Referral Services (211)
The 211 service provides access to information from government service agencies and certain public charity groups.
Nonemergency Services (311)
Some city governments offer 311 service to provide nonemergency information to the community. The caller dials 311 and the Call Agent translates this to the closest nonemergency access office.
The Cisco BTS 10200 Softswitch supports nonemergency services (311) for routing calls to a specified route type and identification. Routes for all nonemergencies (311) are allocated through the destination table by defining the call type ("call-type=non-emg") and the routing information for the dialed digits.
Directory Assistance (411)
The 411 service provides directory assistance. See the "Directory Services (411, 555-1212, 0+ Listing Services)" section.
Repair Service (611)
The 611 service connects to the local telephone repair service (if the service provider offers this service).
Telecommunications Relay Services (711)
The 711 service provides access to telecommunications relay services (TRS).
Local Billing Services (811)
The 811 service connects to the local telephone billing office.
Other n11 Codes
The 511 code (caller access to information about local traffic conditions) is not supported in this release of the Cisco BTS 10200 Softswitch.
Emergency Services (911)
The Cisco BTS 10200 Softswitch supports emergency services (911) as specified in Telcordia document GR-529-CORE, LSSGR: Basic 911 Emergency Service (FSD 15-01-0000).
Other Telcordia reference documents include
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Note
Emergency service is a public safety feature providing emergency call routing to a designated Emergency Service Bureau (ESB), normally called the public safety answering point (PSAP) in the United States. The 3-digit 911 number is assigned for public use in many areas of the United States and Canada for reporting an emergency and requesting emergency assistance. Depending on municipal requirements and procedures, an ESB attendant can transfer the call to the proper agency, collect and relay emergency information to the agency, or dispatch emergency aid directly for one or more participating agencies.
911 calls are location dependent and must be selectively routed to the appropriate PSAP depending on where the call originates. The routing process is part of the Enhanced 911 (E911) feature set and works as follows:
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Once the caller is connected to the PSAP attendant, the PSAP system typically displays the caller's directory number to the PSAP attendant. Additional data (such as the subscriber's name, address and closest emergency response units) may also be retrieved from the local carrier automatic location identification (ALI) database and displayed to the PSAP attendant.
Note
Special emergency functions can be provided via a channel-associated signaling (CAS) trunking gateway (TGW) that supports ESB trunks or emergency service line (ESL) trunks with MF signaling. Examples of special emergency functions include:
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Feature Interactions
The following feature interactions apply to emergency calls (call-type=EMG):
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Note
Operator Services
The Cisco BTS 10200 Softswitch supports operator services as specified in Telcordia Requirement FR-271, Operator Services Systems Generic Requirements (OSSGR). This section describes:
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Subscriber Access to Operator
Operator services is a call-processing function whereby callers can access either a live operator or an automated function to complete calls or gain access to information. The service provider can provide this feature or outsource it to a third-party vendor. Some additional functions accomplished by operator services include automatic call distribution, billing detail recording, and information retrieval. The following numbers are commonly used to access operator services:
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Operator services provided to callers include:
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Busy Line Verification (BLV) and Operator Interrupt (OI) Services
This section describes busy line verification (BLV) and operator interrupt (OI) services. OI is also referred to as emergency interrupt (EI). BLV and OI services are based on GR-1176 (FSD 80-01-0300), Busy Line Verification, part of Telcordia OSSGR requirements (FR-271).
Description and Operation
BLV service permits the user to obtain operator assistance to determine if a called line is in use. The user dials 0, waits for the operator to pick up the line, and requests BLV service. OI service permits the operator to speak directly with the busy party. The service provider can deny BLV service to any subscriber by setting type=denied for fname=BLV in the subscriber-feature-data table (see the BLV provisioning link listed below). Note that denying BLV also denies OI.
BLV and OI services work as follows:
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Note
The BLV feature can be made available to all subscribers lines connected to a Cisco BTS 10200 Softswitch using the default office service ID. See the "Default Office Service ID" section for a general description of this provisionable service.
Feature Interactions
The following feature interactions are applicable to the BLV and OI services:
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Network Services
The Cisco BTS 10200 Softswitch supports the network services listed in Table 3-3.
8XX (Toll-Free Calling)
The purpose of the toll-free feature is to have the called party, rather than the calling party, charged for the call. These calls are prefixed with the 1+8XX service access codes. The seven digits following the 8XX codes are used for routing the call. For an inbound/outbound 8XX call, the Cisco BTS 10200 Softswitch checks the local toll-free database first. If the corresponding DN is not found in the local toll-free database, the system sends a query to the service control point (SCP) to request the corresponding DN.
All aspects of toll-free calling are transparent to the caller. A caller expects to dial 1-8XX-NXX-XXXX to reach the desired destination. The company that translates the number to a specific DN, and the company that routes the call, must appear transparent to callers. Most callers are not aware that their dialed 8XX number is changed into a specific DN. What matters to the callers is that they reach what they perceive to be the called number, and they are not billed for the call.
Note
8XX Call Processing
The system processes outbound 8XX calls as follows:
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Figure 3-1 shows the processing of an outbound 8XX call placed by a subscriber.
Figure 3-1 Processing of an Outbound 8XX Call
Notes for Figure 3-11.
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Local Toll-Free Database
This section explains how the system uses information from the local toll-free database.
The Cisco BTS 10200 Softswitch provides the ability to translate inbound/outbound 8XX numbers at the Feature Server (FS) using a local 8XX database. The 8XX service supports the following features:
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The Cisco BTS 10200 Softswitch also supports optional DNIS service. In an 8XX DNIS service, when a call is terminated to a PBX (call center), 4 digits are outpulsed to the PBX to identify the originally dialed 8XX number. In case of custom DNIS, up to 22 digits can be outpulsed with additional information such as:
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When a translated number (for an original 8XX call) is received, the Analyzed Info DP triggers the FS. The Cisco BTS 10200 Softswitch looks up the DNIS and TG information for the call. The DNIS information is then outpulsed to the PBX. If an overflow condition is encountered, the call is routed to the overflow trunk. The overflow trunk can be a PSTN trunk.
See SR-2275, Telcordia Notes on the Network, Section 14.6 for additional information on toll-free database services.
SCP-Based Toll-Free Services
This section explains how the system uses information from the external toll-free database.
The Cisco BTS 10200 Softswitch communicates with an SCP-based database called the toll-free database service, which contains information for routing the call. The database service provides information about the network service provider selected to complete the call, and information for translating the toll-free number to a specific 10-digit directory number (DN). The routing of the call can vary depending on the arrangements made between the toll-free subscriber and the network service provider. These arrangements can include selective routing based on the time of day, day of week, and location from which the call originates.
Provisioning Commands
To provision this feature, see the 8XX (Toll-Free Calling) provisioning procedure in the Cisco BTS 10200 Softswitch Provisioning Guide.
Calling Party Number Options for Outgoing SETUP Messages
This feature allows the service provider to control the calling party number (CPN) data sent in the outbound SETUP message on redirected calls outbound from the Cisco BTS 10200 Softswitch to the PSTN.
The CPN option is provisionable (via CLI commands) using the SEND-RDN-AS-CPN token in the TRUNK-GRP table:
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N is the default value.This feature is applicable to the following scenarios:
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Figure 3-2 shows an example of the networks and phones involved in redirection by a subscriber phone. Table 3-4 explains how to provision the SEND-RDN-AS-CPN token for various call-redirection scenarios and results.
Figure 3-2 General Network View for Redirection by a Subscriber Phone
Table 3-4 Provisioning SEND-RDN-AS-CPN Token in TRUNK-GRP Table for Redirection by a Subscriber Phone
CPN and RDN
Data
(Example)
Provisioned for SEND-RDN-
AS-CPN
Outbound
SETUP
MessageOn-net to off-net call (either of the following):
A -> B -> fwd -> C -> fwd -> off-net
A -> C -> fwd -> off-net
CPN=
972-555-1111RDN=
972-555-3333Y
Overwrite CPN
with RDNCPN=
972-555-3333RDN=
972-555-3333N
Do not change CPN
CPN=
972-555-1111RDN=
972-555-3333Off-net to on-net to off-net call:
Inbound off-net call -> B -> fwd -> off-net
Note
(from the incoming SETUP message)
is 817-555-8888.
The new RDN is the DN of the forwarding phone, Subscriber B—972-555-2222.CPN=
214-555-7777RDN=
817-555-8888(from incoming SETUP message)
Y
Overwrite CPN
with RDNCPN=
972-555-2222RDN=
972-555-2222N
Do not change CPN
CPN=
214-555-7777RDN=
972-555-2222
Figure 3-3 shows an example of the networks and phones involved in redirection of a basic or Tandem call. Table 3-5 explains how to provision the SEND-RDN-AS-CPN token for call-redirection scenarios and results. Note that the content of the outbound SETUP message depends on whether the RDN is available in the incoming SETUP message.
Figure 3-3 General Network View for Redirection of Basic or Tandem Call
Table 3-5 Provisioning SEND-RDN-AS-CPN Token in TRUNK-GRP Table for Redirection of Basic or Tandem Call
CPN and RDN
Data
(Example)
Provisioned for SEND-RDN-
AS-CPN
Outbound
SETUP
MessageOff-net to off-net call (basic or Tandem)
with RDN available in the incoming
SETUP message:off-net call -> Cisco BTS 10200 Softswitch
-> off-netCPN=
214-555-7777RDN=
817-555-8888(from incoming SETUP message)
Y
Overwrite CPN
with RDNCPN=
817-555-8888RDN=
817-555-8888N
Do not change CPN
CPN=
214-555-7777RDN=
817-555-8888Off-net to off-net call (basic or Tandem)
with RDN not available in the incoming
SETUP message:off-net call -> Cisco BTS 10200 Softswitch
-> off-netCPN=
214-555-7777RDN not available
(from incoming SETUP message)
Y
Do not change CPN
CPN=
214-555-7777RDN not available
N
Do not change CPN
CPN=
214-555-7777RDN not available
Tip
Dialing Parity (IntraLATA Toll Presubscription)
The Cisco BTS 10200 Softswitch supports this feature in accordance with Telcordia document GR-693-CORE, LSSGR: Presubscription Indication (FSD 20-24-0000).
Dialing parity—also known as intraLATA toll presubscription—allows subscribers to select a telecommunications company for intraLATA calls (local toll calls) in the same way they select a long-distance provider. With dialing parity, subscribers are able to dial the number they want and have a preselected carrier—a competitive local exchange carrier (CLEC), incumbent local exchange carrier (ILEC), or a long-distance carrier—automatically handle the call if it is a local (intraLATA) toll call. Preselecting a local toll carrier eliminates the need for dial-around service for local toll calls (101XXXX numbers). Prior to implementation of dialing parity, long-distance carriers provided intraLATA service by dialing around an ILEC or CLEC via 101XXXX numbers (carrier access codes—CACs).
Local access and transport areas (LATAs) were created after the breakup of the AT&T system. LATAs are also known as called service areas or local toll calling areas. CLECs and ILECs provide two types of calls to their subscribers within the LATA:
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Local toll calls are typically calls to places more than 16 miles from the subscriber location in urban areas and more than 13 miles in rural areas. Local toll calls do not qualify as either local or long distance—they are between the two and are subject to different rates.
Lawful Intercept Interface
This section describes the lawful intercept interface supported by the Cisco BTS 10200 Softswitch.
General Description of Lawful Intercept Implementation
The Cisco BTS 10200 Softswitch supports the call data interface and call content function for lawful intercept, along with the provisioning interface required to configure a wiretap. The Cisco BTS 10200 Softswitch provides support for lawful intercept using two different, industry-developed architectures: PacketCable and the Cisco Service Independent Intercept (SII). Depending on their network type, service providers may choose to configure their networks consistent with either of these architectures in their effort to meet their obligations related to lawful intercept. Given the constantly evolving nature of industry-developed standards, service providers must recognize that the features and functionality of the Cisco BTS 10200 Softswitch described below may also be subject to change over time.
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Lawful Intercept Provisioning Interface
The Cisco BTS 10200 Softswitch supports a secure provisioning interface to process wiretap requests from law enforcement agencies through a mediation device. The service provider can limit viewing and provisioning of these parameters to selected authorized personnel. The applicable parameters (entered via CLI) include the DN, tap type, and call data channel for data transmission. The tap type specifies whether the tap order is a pen register (outgoing call information), a trap and trace (incoming call information), a pen and trace (incoming and outgoing call information), or an intercept (bidirectional plus the call content).
Lawful Intercept Call Data Interface
The Cisco BTS 10200 Softswitch provides the PacketCable EMS/RADIUS interface for the transmission of call identifying information to the lawful intercept delivery function (DF) server as required by Appendix A, PCES Support, in PKT-SP-EM-I08-040113, PacketCable Event Messages Specification (EMS), January 13, 2004.
Full call-identifying information (call data) is shipped to a DF server from the Cisco BTS 10200 Softswitch for the subject under surveillance for various call types (for example, basic call and call forwarding).
Lawful Intercept Call Content Function
The call content function provides for capturing voice in a replicated Real-Time Transport Protocol (RTP) stream. The Cisco BTS 10200 Softswitch can be configured to operate with simultaneous support for PacketCable intercept and Cisco SII, or with Cisco SII only.
Simultaneous support for PacketCable intercept and Cisco SII is achieved as follows: During the call-setup phase, the Cisco BTS 10200 Softswitch searches for a PacketCable-compliant call-content intercept access point (IAP) in the call path. If the Cisco BTS 10200 Softswitch determines that there is no such IAP available in the call path, it falls back to Cisco SII.
Note
Additional information about each type of intercept is provided below:
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The Cisco BTS 10200 Softswitch uses Common Open Policy Service (COPS) protocol when sending the above request to an aggregation router, and Media Gateway Control Protocol (MGCP) when sending the request to a trunking gateway.
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Local Number Portability (LNP)
The Cisco BTS 10200 Softswitch supports the local number portability (LNP) feature. For further information, see Number Portability Switching Systems, T1.TRQ-02-2001, which provides unofficial agreement within T1S1. T1S1 is the ATIS accredited body for signaling. This document is available at http://www.atis.org.
LNP permits subscribers who change their local phone company to keep their existing telephone numbers. An FCC order requires this feature in the 100 top metropolitan service areas in the United States. LNP permits calls to be routed to the subscriber's new local switch without any particular per-call action required of either the calling or called party. Each switch contains a database of the office codes (NPA-NXXs) associated with subscriber numbers that have been ported in and ported out.
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Note
The Cisco BTS 10200 Softswitch supports the LNP function as follows:
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Network Loopback Test for NCS/MGCP Subscriber Endpoints
This feature allows support for a network loopback test on any MGCP/NCS subscriber endpoints controlled by the Cisco BTS 10200 Softswitch. With Release 4.4.x, the system supports line-side testing only. The procedure for setting up the test includes configuring the test lines as subscriber terminations and provisioning the MGW parameters. The procedure is described in the Release Notes document.
The following limitations apply:
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Split-NPA
When DNs are exhausted within an NPA, an additional NPA is assigned to the region. The new NPA may be allocated as an overlay over the existing NPA, in which case there is no major impact to the Cisco BTS 10200 Softswitch. However, when the new NPA is assigned based on a geographical split of the region, there are significant impacts. The assignment of the new NPA based on a geographical split is referred to as split-NPA.
The split-NPA feature impacts both provisioning (EMS) and call processing subsystems in the Cisco BTS 10200 Softswitch. Several provisioning tasks must be performed to introduce a new NPA into a region, including:
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Note
Before the permissive period begins, subscribers affected due to the split-NPA can be reached only via the old NPA. Duplicate records for both old and new NPA are created before the permissive period begins.
During the permissive period, both old and new NPA can be dialed (10-digit dialing is required to reach a subscriber in the affected NPA). The subscriber (ANI) and subscriber feature data records are updated to the new NPA during the permissive period.
Once the permissive period ends, subscribers affected due to the split-NPA can be reached only via the new NPA. This is referred to as the mandatory dialing period for the new NPA. The duplicate records created before the permissive period are cleaned up after the mandatory period begins.
For additional information on split-NPA, see the ATIS document INC97-0404-016, NPA Code Relief Planning & Notification Guidelines.
T.38 Fax Relay
The Cisco BTS 10200 Softswitch communicates with MGWs to permit faxes to be transported across the IP network in the MGCP and H.323 control environments. The process is based on the following standards documents:
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The system supports three fax modes:
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In T.38 CA-controlled mode, the CA instructs the gateway to switch to T.38 fax mode in real time. The CA receives a signal (Request mode for H.323 and Notify(fax) for MGCP) when fax signaling starts and stops. The CA maps the fax messages according to the protocol (MGCP or H.323) used for the originating and terminating messages. Billing records are generated in the CA based on fax start and stop signals. For information, see industry standards documents on H.323 Annex D version 2 (also incorporated into H.323 version 4) and MGCP FXR package.
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Trunk Testing
Trunk testing is used to evaluate the transmission quality of the shared trunks that interconnect switching systems. Trunk testing is extremely important in monitoring system health, because it is the only practical way to objectively evaluate the performance of individual trunks.
Trunk testing requires the following equipment and test lines. (Some additional types of equipment and lines may also be used.) A basic system setup is shown in Figure 3-4.
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Figure 3-4 Trunk Testing Setup
Near End Test Origination Test Calls
The Cisco BTS 10200 Softswitch supports calls used to test individual trunks that connect a local gateway with a gateway or PSTN switch at a remote office. The Cisco BTS 10200 Softswitch supports OTL and TTL capability. User-provided test equipment and, optionally, test controllers may be connected to the test lines. Proper selection of test equipment and test functions helps to ensure interoperability between different carriers.
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The process for testing a Cisco BTS 10200 Softswitch OTL is as follows:
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The complete trunk address in this example is 00030018.
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The technician dials KP-00030018-104-ST.
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The complete test string in this example is PREFIX | 00030018 | 9581104 | END.
Note
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1xx Test Line Support
When the Cisco BTS 10200 Softswitch is the near-end switch, the following process takes place at the remote switch:
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When the Cisco BTS 10200 Softswitch is supporting the TTL capability (test call originated at another switch), the process is as follows. The Cisco BTS 10200 Softswitch receives the 958 or 959 call, recognizes the 958 or 959 type, and routes the test to the appropriate test line.
T108 Test Line Support
The T108 test line feature determines the performance of trunks connecting digital exchange switches, including voice over packet (VoP) softswitches. Cisco BTS 10200 Softswitch incoming trunks requesting other 1xx-type test lines are routed to shared test lines for the requested tests, regardless of which gateway terminates the trunk or which gateway/IAD terminates the test line. The T108 test line feature requests a test to be performed within the same gateway where the trunk under test (TUT) is terminated, and provides a digital loopback within the gateway. The T108 test line feature supports manual and automated testing.
The T108 test line sequence is as follows:
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Note
