[asterisk-dev] Pedantic

[Olle E. Johansson]

15 apr 2009 kl. 19.10 skrev Mark Michelson:

> David Hansen wrote:
>> What exactly is setting pedantic useful for?  What conditions would  
>> warrant setting this to yes?
>>
>> David Hansen
>>
>
> Basically, you can think of the pedantic setting as being one that  
> is important
> to SIP purists or those who do make use of more advanced/less used  
> nuances of
> the SIP protocol.
>
> For instance, RFC 3261 plainly spells out that the way to identify  
> whether an
> incoming message belongs to a specific dialog is to check the call- 
> id, to tag,
> and from tag. With pedantic mode disabled, all we look at is the  
> call-id because
> in the majority of situations, the call-id is suitable for  
> identifying which
> dialog the request belongs to. However, if you know that tag  
> checking is
> important, then it will be enabled by turning on pedantic mode.

I would say that Mark's view is a bit simplified. If you have a PBX  
and a few local
phones on the same LAN, we can skip some of the requirements of the SIP
standard to make life more simple. On the other hand, in that case you  
do have
the processing power, so it's not a problem anyway.

If your asterisk is part of a larger infrastructure with forking SIP  
proxys,
and you need to interoperate with other SIP services, not just the local
set of phones that only talks with your Asterisk, then you *have* to  
enable
pedantic to get things working properly.

I personally think that the pedantic mode is a strange setting that we  
should
remove. It was the first thing I removed from pineapple (chan_sip3)  
when I
started that project (before it stopped).

Setting it to yes will never hurt, unless you have a very small CPU  
(which
can't handle many calls anyway). Setting it to "no" might be very bad  
for you.

/O