Nortel Networks Mediant TP-1610 SIP - Manual (Page 16)

Mediant 2000 SIP
Mediant 2000 SIP User’s Manual 16 Document #: LTRT-72504
1.3.3 PSTN-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.
1.3.3.1 Supported 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
.
• 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).
1.3.4 Supported 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.