[OpenSIPS-Users] Cisco SIP phone 7940 do not put parameter "did" in R-URI of ACK request

[Bogdan-Andrei Iancu]

Hi Andrei,

Do you use TH without dialog support right ? IF so, try with dialog 
support (just create the dialog before doing TH) - this will shorten the 
"did" param A LOT and maybe Cisco will not discard it.

Also, do you obfuscate the Call-ID too ? if not, with dialog support, 
you may try to use dlg_match_mode [1] with 1 (DID_FALLBACK) to try a SIP 
matching if the DID param is matching

[1] 
https://opensips.org/html/docs/modules/2.4.x/dialog.html#param_dlg_match_mode

Regards

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
OpenSIPS Bootcamp Pre-Registration
   https://opensips.org/training/OpenSIPS_Bootcamp/

On 11/8/19 4:01 PM, Андрей Неважно via Users wrote:
>
> Hello guys! Sorry for desturbing you, but maybe someone know, how i 
> can fix this problem on Cisco SIP phone 7940:
> 1) Cisco SIP phone received 200 ok with Contact like:
> Contact: 
> <sip:1.1.1.1;did=TUFgRzw2JH97fHt4eXp3en53bRR0dXdtfnt1b3pxYVDJhjkfhhsdfJBNVsadgdsfdhgewh->
>
> 2) Cisco SIP phone send ACK with R-URI like:
> Request-Line: ACK sip:1.1.1.1:5060 SIP/2.0
>
> Parameter "did" lost in R-URI, and ACK can not pass 
> topology_hiding_match() properly.
> Maybe anybody know how this problem can fixed from phone side?
> Many thanks!
>
> -- 
> Andrei
>
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