[asterisk-dev] 404 from SIP qualify packets

[Olle E Johansson]

22 apr 2006 kl. 11.08 skrev Steve Hill:

>
> If you have a SIP server set up as a peer with qualify turned on,  
> Asterisk sends OPTIONS packets like:
>
> OPTIONS sip:example.com SIP/2.0
>
> I noticed in the SIP debugging that this causes 404 packets to come  
> back from one of my peers - is it legal to make an OPTIONS request  
> without a username part? I.e. isn't it required to send something  
> like:
>
> OPTIONS sip:foo at example.com SIP/2.0
>
> (in the first example, wouldn't the peer assume that "example.com"  
> was an unqualified address and qualify it to  
> "example.com at example.com"?)
>

You can send options to any SIP uri. Usually an OPTIONS without a  
username part is sent to a proxy to check whether the
domain-server is up and running.

For asterisk, we don't really care about the answer, we just need an  
answer. So the 404 is a valid answer for us, even
though it doesn't look good if you read the debug logs. If a device  
is registred with us, we send OPTIONs to the contact
URI registred with the REGISTER request.

/Olle