[asterisk-users] Called number changed on SNOM 821

[Luca Bertoncello]

Am 28.12.2021 um 17:22 schrieb Antony Stone:

Hi Antony

> I mean the response from the called telephone in reply to the INVITE, which 
> contains the SIP code "180 Ringing" and may optionally have an RPID header.

OK, I see something strange...

Here what I see if I call my mobile phone (then the number "changes"):

Via: SIP/2.0/UDP
192.168.60.53:3072;branch=z9hG4bK-tzms3vciubaj;received=192.168.60.53;rport=3072
From: "Sekretariat" <sip:74 at 192.168.60.1>;tag=8o3bow73en
To: <sip:01773218409 at 192.168.60.1;user=phone>;tag=as234ad778
Call-ID: 313634303730333537323534383539-zw0qs5wmmpd2
CSeq: 2 INVITE
Server: Asterisk PBX 16.2.1~dfsg-1+deb10u2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY,
INFO, PUBLISH, MESSAGE
Supported: replaces
Contact: <sip:01773218409 at 192.168.60.1:5060>
P-Asserted-Identity: "03529529874" <sip:03529529874 at 192.168.60.1>
Content-Length: 0

and here what I see if I call another mobile phone (then the number does
NOT change):

Via: SIP/2.0/UDP
192.168.60.53:3072;branch=z9hG4bK-qjbxwwkv3n3p;received=192.168.60.53;rport=3072
From: "Sekretariat" <sip:74 at 192.168.60.1>;tag=fararstgh4
To: <sip:01752029899 at 192.168.60.1;user=phone>;tag=as7da4425c
Call-ID: 313634303730333630353537373731-7x9ey0nf5gm2
CSeq: 2 INVITE
Server: Asterisk PBX 16.2.1~dfsg-1+deb10u2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY,
INFO, PUBLISH, MESSAGE
Supported: replaces
Contact: <sip:01752029899 at 192.168.60.1:5060>
Content-Length: 0

So, I see, there is a "P-Asserted-Identity"... But I can't understand why...

Any idea?

Thanks
Luca Bertoncello
(lucabert at lucabert.de)