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Example Using non-Call ID Detection
In this example the following SIP header is sent to the Vega:
TWID: TW-CALL-SERVER-00000108-48d11387:-T2
It’s this header rather than the Call ID header which needs to be used to detect a SIP loopback. In this case the Call ID is different for the two legs of the call (so cannot be used for detection).
To detect the “TWID” header the following settings would be used:
set ._advanced.sip.loopback_detection.sip_header=”TWID”
set ._advanced.sip.loopback_detection.sip_header_regex=”<TW\-CALL\-
SERVER\-.*>:.*”
In this case the Vega will look for two calls where the TWID header has the same content. Everything from the start of the TWID header up to (but not including) the “:-T2”. The position of the “<” and “>” indicate the section the vega will use for comparison.
Configuration
The following parameters control Un-Tromboning:
Parameter
e1t1.port.1.isdn.untromboning_enable
Possible values:
0 – Default – Do not allow un-tromboning
1 – Enable un-tromboning
Parameter:
_advanced.isdn.untromboning.type
Possible values:
standard – Default – Use standard message format for un-tromboning
ericsson – Use Ericsson proprietary message format
Parameter:
_advanced.sip.loopback_detection
Possible values:
0 – Default – Disable SIP loop detection
1 – Enable loop detection for SIP calls
