CPE SIP Products
context=<gateway IP address>”. The <source trunk group ID> is the Trunk Group ID where incoming calls from Tel is received. For IP-Tel calls, the SIP 200 OK device's response contains “tgrp=<destination trunk group ID>;trunk-context=<gateway IP address>”. The <destination trunk group ID> is the Trunk Group ID used for outgoing Tel calls. The <gateway IP address> in “trunk- context” can be configured using the parameter SIPGatewayName.
[3]UCR 2008 = Interworks the hotline "Off Hook Indicator" parameter between SIP and ISDN:
For IP-to-ISDN calls:
-The device interworks the SIP tgrp=hotline parameter (received in INVITE) to ISDN Setup with the Off Hook Indicator IE of “Voice”, and “Speech” Bearer Capability IE. Note that the Off Hook Indicator IE is described in UCR 2008 specifications.
-The device interworks the SIP tgrp=hotline-ccdata parameter (received in INVITE) to ISDN Setup with an Off Hook Indicator IE of “Data”, and with “Unrestricted 64k” Bearer Capability IE. The following is an example of the INVITE with tgrp=hotline- ccdata:
INVITE sip:1234567;tgrp=hotline-ccdata;trunk- context=dsn.mil@example.com
For ISDN-to-IP calls:
-The device interworks ISDN Setup with an Off Hook Indicator of “Voice” to SIP INVITE with “tgrp=hotline;trunk- context=dsn.mil” in the Contact header.
-The device interworks ISDN Setup with an Off Hook indicator of “Data” to SIP INVITE with “tgrp=hotline-ccdata;trunk- context=dsn.mil” in the Contact header.
-If ISDN Setup does not contain an Off Hook Indicator IE and the Bearer Capability IE contains “Unrestricted 64k”, the outgoing INVITE includes “tgrp=ccdata;trunk-context=dsn.mil”. If the Bearer Capability IE contains “Speech”, the INVITE in this case does not contain tgrp and trunk-context parameters.
[4]Hotline Extended = Interworks the ISDN Setup message’s hotline "OffHook Indicator" Information Element (IE) to SIP INVITE’s Request-URI and Contact headers. (Note: For IP-to- ISDN calls, the device handles the call as described for option [3].)
The device interworks ISDN Setup with an Off Hook Indicator of “Voice” to SIP INVITE Request-URI and Contact header with “tgrp=hotline;trunk-context=dsn.mil”.
The device interworks ISDN Setup with an Off Hook indicator of “Data” to SIP INVITE Request-URI and Contact header with “tgrp=hotline-ccdata;trunk-context=dsn.mil”.
If ISDN Setup does not contain an Off Hook Indicator IE and the Bearer Capability IE contains “Unrestricted 64k”, the outgoing INVITE Request-URI and Contact header includes “tgrp=ccdata;trunk-context=dsn.mil”. If the Bearer Capability IE contains “Speech”, the INVITE in this case does not contain tgrp and trunk-context parameters.
Note: IP-to-Tel configuration (using the parameter PSTNPrefix) overrides the 'tgrp' parameter in incoming INVITE messages.
SIP Release Notes | 110 | Document #: LTRT-26901 |
