[asterisk-users] SIP Registration and INVITE question

[Olle E. Johansson]

7 apr 2009 kl. 12.08 skrev Steve Davies:

> 2009/4/7 Olle E. Johansson <oej at edvina.net>:
>>
> [snip]
>>
>> The REGISTER request in the RFC was really written for a device.
>> The way providers use it for trunks with multiple DIDs is outside  
>> of the
>> RFC and is discussed in relation to the SIPconnect specification in
>> the SIP forum.
>>
>> Some providers solve this by not using the Contact: in the register
>> request at all for the calls, instead guessing a URI with the DID
>> in the user name part, something that breaks communication
>> even more as the Contact might include other hints on call routing
>> internally, like line button in a SNOM phone.
>>
>> I would say that the only way right now is to parse the To: header.
>> I started working on some code a while ago that would handle
>> this better, but never completed it. We simply registered a random
>> string and then replaced it with whatever was sent in the To: header
>> (which should be the original destination) before hitting the  
>> dialplan.
>> That code still exists in a branch somewhere and in Pineapple.
>>
>> This code would also solve the issue with registering multiple
>> accounts with one provider.
>> /O
>>
>
> Thanks Olle, as always, a useful response :)
>
> In the meantime, I suspect  that the following is the current dialplan
> based workaround for calls that come in to 's' because of a default
> Registration Contact?

Yes, if you don't add an extension at the end of the register=
configuration, Asterisk defaults to "s" which really is used
all around Asterisk when we don't have a given extension.


/O