asterisk users - Oct 2022 - @-sign gets transmitted as %40 in outgoing SIP packets (CallerID)

Hi list,

I'm using Asterisk 11.25.0 and would like to set 
"anonymous at anonymous.invalid" as outgoing caller ID via SIP:

Set(CALLERID(num)=anonymous at anonymous.invalid)

However, when I look at the outgoing packet with tcpdump I see that the 
@ is not being transmitted correctly:

From: <sip:anonymous%40anonymous.invalid at x.x.x.x>;tag=as26264e65

My question is how can I get Asterisk to send a "@" instead of
"%40"?

Thank you!
Markus

On Mon, Oct 17, 2022 at 10:02 AM Markus <universe at truemetal.org> wrote:
> Hi list,
>
> I'm using Asterisk 11.25.0 and would like to set
> "anonymous at anonymous.invalid" as outgoing caller ID via SIP:
>
> Set(CALLERID(num)=anonymous at anonymous.invalid)
>
> However, when I look at the outgoing packet with tcpdump I see that the
> @ is not being transmitted correctly:
>
> From: <sip:anonymous%40anonymous.invalid at x.x.x.x>;tag=as26264e65
>
> My question is how can I get Asterisk to send a "@" instead of
"%40"?
>
The number is sent as the user portion in SIP. That can't have the
"@" in
it, as that is invalid and against spec - it gets turned into "%40".
If
what you ACTUALLY want is the user portion to be "anonymous" and the
domain
portion to be "anonymous.invalid" then you may be able to set the
callerid
presentation[1] to not be allowed:

Set(CALLERID(pres)=prohib)

Though I haven't tested it on chan_sip in 11.

[1] https://wiki.asterisk.org/wiki/display/AST/Asterisk+11+Function_CALLERID

-- 
Joshua C. Colp
Asterisk Project Lead
Sangoma Technologies
Check us out at www.sangoma.com and www.asterisk.org
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