### Description
Upon interfacing with a specific carrier’s cloud relay service, upon the
termination of the call by the called party after the phone rings, the tag
value within the To header of the 408 response from the cloud relay side is
altered. When Kamailio relays this 408 response to FreeSwitch, the sofia-sip
protocol stack employed by FreeSwitch perceives it as a distinct dialog and
does not promptly conclude the call. Given that the carrier’s personnel may
lack the capability or the inclination to effect changes, we are looking to
accommodate this scenario on the Kamailio side. Upon receipt of the 408
response from the carrier, we will determine if there has been a modification
to the tag value in the To header. If such a change is detected, prior to
forwarding the 408 response to FreeSwitch, we will rectify the tag value in the
To header of the 408 response to correspond with the tag value from the 18x
signaling messages.
Our system :
OS: Rocky Linux release 9.3 (Blue Onyx)
Kamailo vesion 5.7.3
### Troubleshooting
#### Reproduction
In the kamailio.cfg, invoke a Python script within the
onreply_route[MANAGE_REPLY] block
The following two scenarios both result in content-related errors: 1. First,
the ‘To’ header field is removed using msg.call_function(‘remove_hf’, ‘To’),
and then the modified ‘To’ header field is added using
msg.call_function(‘append_hf’, sip_to). 2. The tag value in the ‘To’ header
field is changed back to the original value using
msg.call_function(‘replace_hdrs’, toTag, originalToTag).
#### Log Messages
Dec 4 13:45:00 sipp102 ./kamailio[391888]: INFO: {2 92091734 INVITE
a18e6868-2ca5-123e-a394-00163e347028} app_python3 [mod_Logger.c:172]:
logger_LM_INFO(): recv 408, sip_to_field_val =
<sip:130679333xx@39.106.31.1xx:5060>;tag=3b47-eb967d112cba8f7d5eb856259e056294
toUri = <sip:130679333xx@39.106.31.1xx:5060> toTag =
tag=3b47-eb967d112cba8f7d5eb856259e056294 originalToTag = tag=as73409c31
Dec 4 13:45:00 sipp102 ./kamailio[391888]: CRITICAL: {2 92091734 INVITE
a18e6868-2ca5-123e-a394-00163e347028} <core> [core/mem/q_malloc.c:515]:
qm_free(): BUG: bad pointer 0x7f60c10a88a0 (out of memory block!) called from
app_python3: python_msgobj.c: msg_call_function(258) - ignoring
#### SIP Traffic
Received 408：
Forwarded 408:
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https://github.com/kamailio/kamailio/issues/4050
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