SIP User's Manual 510 Document #: LTRT-12801
MP-500 MSBG
9.10 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:
îš„ If the remote party (PSTN/PBX) is busy and the FXO device detects a Busy tone, it
sends 486 Busy to IP. If it detects a Reorder tone, it sends 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.
îš„ 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.
9.11 Supported RADIUS Attributes
Use the following table for explanations on the RADIUS attributes contained in the
communication packets transmitted between the device and a RADIUS Server.
Table 9-5: Supported RADIUS Attributes
Attribute
Number
Attribute
Name
VSA
No.
Purpose
Value
Format
Example AAA
1
Request Attributes
1 User-Name
Account number or calling
party number or blank
String
up to 15
digits
long
5421385747
Start
Acc
Stop
Acc
4
NAS-IP-
Address
IP address of the
requesting device
Numeric 192.168.14.43
Start
Acc
Stop
Acc
6
Service-
Type
Type of service requested Numeric 1: login
Start
Acc
Stop
Acc
26
H323-
Incoming-
Conf-Id
1 SIP call identifier
Up to
32
octets
Start
Acc
Stop
Acc
26
H323-
Remote-
Address
23
IP address of the remote
gateway
Numeric
Stop
Acc
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