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Version 6.2 127 December 2010
SIP Release Notes 2. Supported Features
2.2 Supported PSTN-SIP Interworking Features
Note: This section is applicable only to digital PSTN products (i.e., Mediant 600,
Mediant 800 MSBG, Mediant 1000 MSBG, Mediant 1000, Mediant 2000, and
Mediant 3000).
The SIP device supports various ISDN PRI protocols such as EuroISDN, North American
NI2, Lucent 4/5ESS, Nortel DMS100, Meridian1 DMS100, Japan J1, as well as QSIG. 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).
The device also supports numerous variants of CAS protocols for E1 and T1 spans,
including MFCR2, 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).
The device simultaneously supports different variants of CAS and PRI protocols on different
E1/T1 spans (no more than four simultaneous PRI variants).
PSTN-to-SIP and SIP-to-PSTN Called and Calling numbers can be optionally modified
according to rules defined using the device's configuration parameters.
Mediant 600, Mediant 800 MSBG, Mediant 1000 MSBG, and Mediant 1000 also support
various ISDN BRI protocols such as Euro-ISDN and QSIG. BRI support includes User
Termination or Network Termination side.
The device supports the following PSTN-SIP interworking features:
Definition and use of Trunk Groups for routing IP-to-PSTN calls.
B-channel negotiation for PRI spans.
ISDN Non Facility Associated Signaling (NFAS). (Not applicable to Mediant 800
MSBG.)
PRI-to-SIP interworking according to RFC 4497 or ISO/IEC 17343.
PRI-to-SIP Interworking of Q.931 Display (Calling Name) information element (IE).
PRI (NI-2, 5ESS)/EURO ISDN/QSIG to SIP interworking of Calling Name using Facility
IE in Setup and Facility messages.
Configuration of Numbering Plan and Type for IP-to-ISDN calls.
Interworking and flexible mapping of PSTN-to-SIP release causes.
Interworking of ISDN redirect number to SIP Diversion header (according to IETF
<draft-levy-sip-diversion-05.txt>) or to History-Info header (RFC 4244).
Optional change of redirect number to called number for ISDN-to-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 or using the phone-context parameter (RFC 4904).
Interworking of Calling and Called Subaddress values for SIP-to-ISDN calls (RFC
4715).
ISDN en-block or overlap dialing for incoming Tel-to-IP calls.
ISDN to SIP interworking of ISDN Overlap Dialing according to RFC 3578.
Digit map pattern to reduce the dialing period when Overlap dialing is used.
Routing of IP-to-Tel calls to predefined trunk groups.