[asterisk-users] Called number changed on SNOM 821

Antony Stone Antony.Stone at asterisk.open.source.it
Tue Dec 28 13:00:41 CST 2021

On Tuesday 28 December 2021 at 19:52:46, Luca Bertoncello wrote:

> Am 28.12.2021 um 19:41 schrieb Antony Stone:
> Hi Antony,
> > Okay, so, returning to my question, do you see any difference between the
> > packet inbound to Asterisk from the called telephone, and the packet
> > outbound from Asterisk to the calling telephone?
> I'm trying to understand what you mean...
> You mean that I should compare what the "180 ringing" in the internal
> network (phone to asterisk) and the external one (asterisk to Telekom)?

Which way round are you making the telephone call?

From your earlier packet capture, it looked to me like you were dialling an 
external number from an internal telephone.

If that is true, then you should be looking for a packet *from Telekom* coming 
in to Asterisk, and a packet *from Asterisk* to the internal telephone - 
remember that these packets are the _reply_ to the INVITE.

INVITE goes from callING telephone to callED telephone.

Response "180 Ringing" goes from the callED telephone to the callING 

> If so, then I have to check again, since I only sniffed the internal
> traffic...

I think it's important to find out what Asterisk is receiving from your 
upstream provider, and whether it is then changing this in what it sends on to 
the calling telephone (the one on which you see the unexpected display).


"It would appear we have reached the limits of what it is possible to achieve 
with computer technology, although one should be careful with such statements; 
they tend to sound pretty silly in five years."

 - John von Neumann (1949)

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