[SR-Users] Issue with From address being modified in ACK when UAC module used version 4.1

[Jonathan Hunter]

Hi Guys,

running kamailio 4.1.4 and using uac_replace_from, I am seeing a strange issue with the proxying of an ACK message back from a carrier to freeswitch on the ingress path into a network.

So its just a normal call inbound, where on outbound leg we modify the From address, on the inbound leg all remains the same.

Now after the ingress side receives the 200ok, it sends an ACK as below;

ACK sip:+441624111111 at 192.168.24.8:5080;transport=udp SIP/2.0
Via: SIP/2.0/UDP 4.4.4.4:5060;branch=z9hG4bK+7f5c8c756ae3b26a956b33b88c77c29f1+sip+3+aa6d1466
Call-ID: 8791dbd3855eeafd484f397de6e2f76e at carrier.peering.telecom.im
From: "+44792498881474" <sip:+44792498881474 at 192.168.24.8:5080;user=phone>;tag=carrier.peering.telecom.im+3+863d20a3+1b9801d2
To: "+441624111111" <sip:+441624111111 at 8.8.8.8:5080;user=phone>;tag=6rrtgNFQDNrFF
CSeq: 1 ACK
Contact: <sip:4.4.4.4:5060>
Route: <sip:192.168.24.8;lr=on;ftag=carrier.peering.telecom.im+3+863d20a3+1b9801d2;vsf=AAAAAAAAAAYNBgAPAAgLAgZ3UTMACgBXFUsVFwwcDkAKTwMZGh0YAA8KDkEEQ1NYC0NDXgdOFRpSHg1vbmU->
Content-Length: 0
Max-Forwards: 68

However kamailio changes the From address;


ACK sip:+441624111111 at 192.168.24.8:5080;transport=udp SIP/2.0
Via: SIP/2.0/UDP 109.73.69.165:5060;branch=z9hG4bKc1ce.47974fc3da2b669a78f2dcc9a057a127.0
Via: SIP/2.0/UDP 4.4.4.4:5060;rport=5060;branch=z9hG4bK+7f5c8c756ae3b26a956b33b88c77c29f1+sip+3+aa6d1466
Call-ID: 8791dbd3855eeafd484f397de6e2f76e at carrier.peering.telecom.im
From: "+44792498881474" <sip:+441444680332 at es132y$}-9>.8n?~9,*%(;zyk393;7e&C^NRone>;tag=carrier.peering.telecom.im+3+863d20a3+1b9801d2
To: "+441624111111" <sip:+441624111111 at 8.8.8.8:5080;user=phone>;tag=6rrtgNFQDNrFF
CSeq: 1 ACK
Contact: <sip:4.4.4.4:5060>
Content-Length: 0
Max-Forwards: 67

Causing FreeSWITCH to not recognise the request, and therefore not send an ACK.

There are no rules set against the ACK processing.

Has anyone seen this before? We dont know when it  started happening which doesnt help, I will look to setup debug on test environment but just wondered if this is an issue thats been seen before?

Many thanks in advance.

Jon

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