Nortel Networks TP-1610 SIP user manual PSTN-to-SIP Interworking, Supported SIP Features

Mediant 2000 SIP

1.3.3PSTN-to-SIP Interworking

The Mediant 2000 gateway performs interworking between ISDN and CAS via E1/T1/J1 digital spans and SIP IETF signaling protocol. 16 E1, T1 or J1 spans are supported (480 channels) in a two modules gateway.

The Mediant 2000 gateway supports various ISDN PRI protocols such as EuroISDN, North American NI2, Lucent 4/5ESS, Nortel DMS100, Meridian 1 DMS100, Japan J1, as well as QSIG (basic call). PRI support includes User Termination or Network Termination side. ISDN-PRI protocols can be defined on an E1/T1 basis (i.e., different variants of PRI are allowed on different E1/T1 spans).

In addition, it supports numerous variants of CAS protocols for E1 and T1 spans, including MFC R2, E&M wink start, E&M immediate start, E&M delay dial/start, loop-start, and ground start. CAS protocols can be defined on an E1/T1 basis (i.e., different variants of CAS are allowed on different E1/T1 spans).

PSTN to SIP and SIP to PSTN Called number can be optionally modified according to rules that are defined in gateway ini file.

1.3.3.1Supported Interworking Features

• Definition and use of Trunk Groups for routing IP PSTN calls.

•B-channel negotiation for PRI spans.

•ISDN Non Facility Associated Signaling (NFAS).

•PRI to SIP interworking according to draft-ietf-sipping-qsig2sip-04.txt.

•PRI to SIP Interworking of Q.931 Display (Calling name) information element.

•PRI (NI-2) to SIP interworking of Calling Name using Facility IE in Setup and Facility messages.

• Configuration of Numbering Plan and Type for IP ISDN calls

•Interworking of PSTN to SIP release causes

•Interworking of ISDN redirect number to SIP diversion header (according to IETF draft-levy- sip-diversion-05.txt).

• Optional change of redirect number to called number for ISDN IP calls.

•Interworking of ISDN calling line Presentation & Screening indicators using RPID header <draft-ietf-sip-privacy-04.txt>.

•Interworking of Q.931 Called and Calling Number Type and Number Plan values using the RPID header.

• Supports ISDN en-block or overlap dialing for incoming Tel IP calls.

• Supports routing of IP Tel calls to predefined trunk groups.

•Supports a configurable channel select mode per trunk group.

•Supports various number manipulation rules for IP Tel and Tel IP, called and calling numbers.

•Option to configure ISDN Transfer Capability (per Gateway).

1.3.4Supported SIP Features

The Mediant 2000 SIP main features are:

•Reliable User Datagram Protocol (UDP) transport, with retransmissions.

•T.38 real time fax (using SIP).

Note: If the remote side includes the fax maximum rate parameter in the SDP body of the Invite message, the gateway returns the same rate in the response SDP.

Mediant 2000 SIP User’s Manual 16 Document #: LTRT-72504