[asterisk-dev] display name used by SIP channel when callerid presentation is not allowed

[Michael Neuhauser]

When callerid presentation is not allowed for an outgoing call, the SIP
channel driver uses "Unknown" as the display name (checked 1.2 and 1.4
in svn). But RFC3261 states:
        A system SHOULD use the display name "Anonymous" if the identity
        of the client is to remain hidden.

I've tested it with a SIP2PSTN provider (that does not support rpid)
like this:
        SetCallerPres(prohib_passed_screen);
        Dial(SIP/provider/${number});
        
The callerid on the call into the PSTN is only suppressed by the
provider if the definition of CALLERID_UNKNOWN in chan_sip.c is changed
to "Anonymous".

Is this only a quirk of this particular provider or should the
definition of CALLERID_UNKNOWN be changed to "Anonymous"?

Regards,
	Mike Neuhauser
-- 
Dr. Michael Neuhauser                              mailto:mike at firmix.at
Firmix Software GmbH                                  sip:mike at firmix.at
Vienna/Austria/Europe                               tel:+43-1-7890849-30
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