[Asterisk-Users] SIP Gerenal settings conufsion

[Jeffrey Starin]

Jonathan!  You don't know how much that simple explanation has helped me 
understand Asterisk.  Well done.  Well said.  And to the point clearly.

I would hope this could find it's way onto the Asterisk Wiki and be the 
*first* thing someone reads when looking at the documentation about sip.

Thanks a million!

J.

Johnathan Corgan wrote:

> Jeffrey Starin wrote:
>
>> I have a little confusion about the general settings (other than the 
>> register values) in the SIP
>> General area. 
>
>
> [snip]
>
>> However, I'm confused as to the purpose of the
>> "general" settings -- to what or which connection do they apply?  Since
>> the context suggested for the general settings is something like
>> "nothing" to avoid unwanted sip calls, I'm confused as to the purposse
>> of values in the general section since all parameters for 
>> communications with VOIP providers is contained in the contexts such 
>> as I specified above, i.e., [FWD] or for example [BROADVOICE].  Can 
>> someone shed some light on that for me?
>
>
> Well, your confusion is understandable, given the way sip.conf works. 
>    Parameters which affect incoming calls are not separated from those 
> that affect outgoing calls, so it's easy to get mixed up (well, for 
> me, anyway.)
>
> In the [general] section the parameters become the defaults used 
> unless overridden in a specific peer section.  Also, if an incoming or 
> outgoing SIP call doesn't match a specific peer section, these 
> parameters get used.
>
> So, for example, if you don't want any incoming SIP calls that aren't 
> from a known provider, you can set the default context to something 
> innocuous as you describe above and the call will get rejected as a 
> non-existent context.  This is what you described in our original mail.
>
> But also in this [general] section are settings for *outbound* calls 
> using SIP that aren't using a specific peer section.  This can be done 
> with the Dial command, using a dial string such as 
> IP/xxxxx at provider.com where provider.com is not listed in sip.conf.  
> This might happen, say, in the case of using the ENUM lookup 
> capability, where the outbound SIP address of a phone number is 
> determined dynamically at call time rather than pre-configured in 
> extensions.conf/sip.conf.
>
> Personally, I'd like to see this changed so there are two 'general' 
> sections--one for default parameters to use unless overridden when 
> there *is* a peer section below, and a different one to describe 
> parameters to use when the remote peer is not previously known.  I 
> know there are ways to accomplish this with the existing sip.conf 
> structure but it seems very counter-intuitive.
>
> -Johnathan
>
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