Hi Daniel,


This is the initial invite from the carrier;


From: "+44792498881474" <sip:+44792498881474@carrier.peering.telecom.im;user=phone>;tag=carrier.peering.telecom.im+4+c538fe37+7570d4e5





From: sr-users <sr-users-bounces@lists.sip-router.org> on behalf of Daniel-Constantin Mierla <miconda@gmail.com>
Sent: 25 January 2017 14:28
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] Issue with From address being modified in ACK whishen UAC module used version 4.1
 

Hello,


is the From in incoming INVITE same as in ACK?


Cheers,
Daniel


On 25/01/2017 15:16, Jonathan Hunter wrote:
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;

Via: SIP/2.0/UDP 4.4.4.4:5060;branch=z9hG4bK+7f5c8c756ae3b26a956b33b88c77c29f1+sip+3+aa6d1466
From: "+44792498881474" <sip:+44792498881474@192.168.24.8:5080;user=phone>;tag=carrier.peering.telecom.im+3+863d20a3+1b9801d2
To: "+441624111111" <sip:+441624111111@8.8.8.8:5080;user=phone>;tag=6rrtgNFQDNrFF
CSeq: 1 ACK
Content-Length: 0
Max-Forwards: 68

However kamailio changes the From address;


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
From: "+44792498881474" <sip:+441444680332@es132y$}-9>.8n?~9,*%(;zyk393;7e&C^NRone>;tag=carrier.peering.telecom.im+3+863d20a3+1b9801d2
To: "+441624111111" <sip:+441624111111@8.8.8.8:5080;user=phone>;tag=6rrtgNFQDNrFF
CSeq: 1 ACK
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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Daniel-Constantin Mierla
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