[OpenSIPS-Users] ACK Loop when changing contact on_reply: Please Help!!!

[Bogdan-Andrei Iancu]

Hi Nick,

As I suspect that your opensips is not an end-point in the call (but 
simply a proxy), I guess the right approach is to reflect the network 
changing in the RR headers, and not in Contact (contact reflects the end 
points in dialog).

I suggest using the record_route_preset() and pushing all the time the 
public IP of opensips in the RR header.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com


On 03/19/2013 04:43 PM, Nick Khamis wrote:
> Hello Muhammad, thanks again for your response. On our test
> environment, our opensips+rtpproxy server is behind NAT, and the
> reason we are modifying the contact header is to point to
> 1001@<opensips-public-ip>  instead of 1001@<opensips-private-ip>. UA
> 1001 is also behind the same NAT.
>
> My first question, do I need to modify the contact header? Or should I
> be paying closer attention to the SDP payload. Making sure c=, and o=
> are pointing to the right locations?
>
> Your help is greatly appreciated.
>
> Nick.
>
> On 3/19/13, Muhammad Shahzad<shaheryarkh at gmail.com>  wrote:
>> Yup, that's expected to happen. ACK is sent to Contact header of 200 OK.
>> So, if you mess up with it, then unexpected results will happen, as in your
>> case you are perhaps setting Contact address of 200 OK pointing to opensips
>> itself, instead of destination party, so ACK will obviously loop as
>> expected.
>>
>> Thank you.
>>
>>
>> On Mon, Mar 18, 2013 at 5:55 PM, Nick Khamis<symack at gmail.com>  wrote:
>>
>>> Hello Everyone,
>>>
>>> We are changing the "Contact" header in the on_reply to a public ip
>>> address using:
>>>
>>> onreply_route[1] {
>>>          xlog("incoming reply\n");
>>>                          if (has_body("application/sdp")) {
>>>                                  remove_hf("Contact");
>>>                                  append_hf("Contact:
>>> <sip:1001 at 75.15.201.2>\r\n");
>>>                                  append_hf("P-hint: Onreply-route -
>>> fixcontact \r\n");
>>>
>>>                          }
>>> }
>>>
>>> When doing so, ACK is going into a loop:
>>>
>>> U 2013/03/18 13:42:11.021017 75.15.201.2:5060 ->  192.168.2.5:5060
>>> ACK sip:75.15.201.2;lr;did=b03.4af9f8f3 SIP/2.0.
>>> Call-ID: VQUK2UGSQBCPHEW27UN5NBJIQM at 81.201.86.45.
>>> CSeq: 102 ACK.
>>> From: "15178334003"<sip:15178334003 at voip.ms>;tag=91641.
>>> To:<sip:1001 at toronto.symack.com>;tag=2643FD58-346926A7.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 75.15.201.2;branch=z9hG4bKcd1e.d68abdc.2.
>>> Via: SIP/2.0/UDP 7
>>>
>>>
>>> Your help is greatly appreciated,
>>>
>>> Nick.
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>>
>>
>>
>> --
>> Mit freundlichen Grüßen
>> Muhammad Shahzad
>> -----------------------------------
>> CISCO Rich Media Communication Specialist (CRMCS)
>> CISCO Certified Network Associate (CCNA)
>> Cell: +49 176 99 83 10 85
>> MSN: shari_786pk at hotmail.com
>> Email: shaheryarkh at googlemail.com
>>
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