[asterisk-users] Called number changed on SNOM 821

Luca Bertoncello lucabert at lucabert.de
Tue Dec 28 13:07:22 CST 2021

Am 28.12.2021 um 20:00 schrieb Antony Stone:

> 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.

This is correct!
I called my mobile phone using a VoIP phone connected to an Asterisk.

> 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 
> telephone.

So do I have to compare the INVITE with the Ringing?

> 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).

OK, so I have to sniff the data to Deutsche Telekom and not the internal
Since the Asterisk is not my own, but of a company, I have to ask
someone to call me from the phone when I sniff the traffic...
I hope, I find someone tomorrow.

Luca Bertoncello
(lucabert at lucabert.de)

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