[Asterisk-Users] Why is the internet connection important to LAN and PSTN calls?

[Olle E Johansson]

11 apr 2006 kl. 16.05 skrev Brent Torrenga:

> Out internet connection was out this morning. It seems that the SIP
> extensions on our LAN were affected. Behavior like:
>
> Call comes in over POTS to a TDM400P, there is a delay then before  
> the Cisco
> 79[46]0's start to ring.
> If we were lucky enough to get a call through, then we could not  
> transfer
> the call, or place the call on hold, or park the call.
> Outbound calls seemed to have a delay between the time they were  
> dialed at
> the SIP phone and when they were connected.
>
> I know this has been brought up before, in fact there is a bit of a
> discussion going on now about DNS SRV (in sip.conf, set  
> srvlookup=no, or put
> all the phone ip's on /etc/hosts). But what is really causing the  
> issue
> here? Yes, it is DNS, or something related to DNS, but why does  
> that have
> anything to do with * trying to make a phone ring on the LAN?

The SRVLOOKUP setting has nothing to do with this, Asterisk will send  
DNS
queries anyway. I just answered a similar question in another mail,  
so check that.

If DNS does not work on your local network, Asterisk will lock up.

/O