[Spce-user] CE 2.6 - send reply to contact

Klaus Peter v. Friedeburg friedeburg at aco.de
Fri Sep 21 12:28:30 EDT 2012

Hi Andreas,

o.k. my mistake I have misspelled the problem and will try again:

I have make an SIP-Capture (see attached pcap-file) and an image from the SIP-flow (see attaches png-file) so you can see what the problem is.
Packet No 28 come from PSTN-Gateway and have a contact-header
But ngcp 2.6 ignore this
The effect is that the phone in the PSTN ringing and you can pick up the call, but the PSTN-Gateway terminate the call after a few seconds
NGCP has not recogniced that the call was establishes for a few seconds
Mediaproxy is still disabled for domain and for the peer

(because of the attaches files I don’t send this message to the list, I have sending an other message (without attachments to the list)

Klaus Peter

> -----Ursprüngliche Nachricht-----
> Von: spce-user-bounces at lists.sipwise.com [mailto:spce-user-bounces at lists.sipwise.com] Im Auftrag von
> Andreas Granig
> Gesendet: Donnerstag, 20. September 2012 21:35
> An: spce-user at lists.sipwise.com
> Betreff: Re: [Spce-user] CE 2.6 - send reply to contact
> On 09/20/2012 09:09 PM, Klaus Peter v. Friedeburg wrote:
> > I have problems to build up the following szenario:
> > My PSTN-Provider have a SIP-loadbalancer with IP This IP is the peering.
> > But the replys must be send to an other the IP ex. (written down in contact header)
> >
> > How is a way to send my replys to the contact ?
> Replies are sent along the Via header vector. If your peering provider
> requires you to send replies to somewhere else than it originated from,
> he should set the Via accordingly.
> If you really must hack that scenario (which horribly breaks the SIP
> RFC, so I'd REALLY not do it), you can use textops module to alter the
> topmost Via in the request already, so replies automatically take
> another path. Not sure if there's a way to change the d-uri of a reply
> because it's forbidden by RFC.
> Andreas

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