[Spce-user] Rtp source address changes after in-dialog Invite

Chris Hoffmann chris021 at gmail.com
Tue Aug 25 03:56:10 EDT 2020


I have a small bit to add to this. I reviewed a number of other calls today
that have been successful with in dialogue invites. It appears this issue
happens when the client does re-invite but the invite does NOT include SDP.
If the re-invite contains SDP the issue doesn't happen.

Happy to supply captures, logs, configs etc if anyone has any ideas.



On Mon, Aug 24, 2020 at 9:27 PM Chris Hoffmann <chris021 at gmail.com> wrote:

> Hi,
> I have a bit of an odd issue that I am struggling with on my sipwise box
> running mr6.5.2
> i have 2 interfaces so my setup looks like this:
> [Upstream Carrier] -------- [int-eth | SIPWISE | ext-eth] ---------- [My
> client]
> 99% of all calls work fine however, I have a client with a Mitel system,
> and when I send them a call which hits an auto attendant they send me
> another invite. When this happens Sipwise stops sending RTP with the
> ext-eth IP as the source and starts sending RTP with the int-eth IP as the
> source. At the same time Sipwise also sends a SIP/SDP 200 OK with the SDP
> packet showing:
> Owner/Creator, Session Id (o): root 1724471111 1724471112 IN IP4
> 192.168.x.x
> this is also the int-eth IP.
> Any ideas on what is going on here?
> Thanks,
> Chris.
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