asterisk users - Dec 2021 - Called number changed on SNOM 821

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)

On Tuesday 28 December 2021 at 17:28:47, Luca Bertoncello wrote:
> 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"):
	.....
> and here what I see if I call another mobile phone (then the number does
> NOT change):
	.....
> So, I see, there is a "P-Asserted-Identity"... But I can't
understand
> why...
> 
> Any idea?
Where exactly were those packets captured?

On the connection from the called telephone sending the reponse in to 
Asterisk?

Or on the connection from Asterisk sending the response out to the calling 
telephone?

(It looks like the latter to me.)

It may well be a good idea to do both and compare, to see whether Asterisk is 
actually adding the header.


Antony.

-- 
3 logicians walk into a bar. The bartender asks "Do you all want a
drink?"
The first logician says "I don't know."
The second logician says "I don't know."
The third logician says "Yes!"

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