SIP User's Manual
478
Document #: LTRT-12804
Mediant 800 MSBG
7.
In the 'Account Table' page, configure a single Account for Hunt Group ID #1,
including an authentication user name and password, and enable registration for this
Account to ITSP 1 (i.e., Serving IP Group is 1).
Figure
8-44: Configuring Account for Registration to ITSP 1
8.
In the 'Inbound IP Routing Table' page, configure that INVITEs with "ITSP1" as the
hostname in the From URI are routed to Hunt Group #1, and INVITEs with "ITSP2" as
the hostname in the From URI are routed to Hunt Group #2. In addition, configure
calls received from ITSP1 as associated with IP Group #1.
Figure
8-45: Configuring ITSP-to-Hunt Group Routin
9.
In the 'Outbound IP Routing Table' page, configure Tel-to-IP routing rules for calls
from Hunt Group #1 to IP Group #1, and from Hunt Group #2 to IP Group #2.
Figure
8-46: Configuring Hunt Group to ITSP Routing
8.3.10 Mapping PSTN Release Cause to SIP Response
The device's FXO interface interoperates between the SIP network and the PSTN/PBX.
This interoperability includes the mapping of PSTN/PBX Call Progress Tones to SIP 4xx or
5xx responses for IP-to-Tel calls. The converse is also true - for Tel-to-IP calls, the SIP 4xx
or 5xx responses are mapped to tones played to the PSTN/PBX.
When establishing an IP-to-Tel call, the following rules are applied:
If the remote party (PSTN/PBX) is busy and the FXO device detects a Busy tone, it
sends a SIP 486 Busy response to IP. If it detects a Reorder tone, it sends a SIP 404
Not Found (no route to destination) to IP. In both cases, the call is released. Note that
if the parameter DisconnectOnBusyTone is set to 0, the FXO device ignores the
detection of Busy/Reorder tones and doesn’t release the call.
For all other FXS/FXO release types (caused when there are no free channels in the
specific Hunt Group), or when an appropriate rule for routing the call to a Hunt Group
doesn’t exist, or if the phone number isn’t found), the device sends a SIP response (to
IP) according to the parameter DefaultReleaseCause. This parameter defines Q.931
release causes. Its default value is ‘3’, which is mapped to the SIP 404 response. By
changing its value to ‘34’, the SIP 503 response is sent. Other causes can be used as
well.
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