[VoIP] Recordings / My Asterisk & Router

[Chad Perkins]

On 2 Feb 2008 at 9:21, John Novack wrote:

[big snip]
 
> Anyone have experience with other routers they would care to share?
> John Novack

I used to run IAX and SIP through Smoothwall back in my cable modem days with no 
trouble (I switched to DSL a couple years back at the same speed but $15 less per 
month when VZ upgraded their plans here in the northeast).

I would do it again if I could squeeze the likes of Smoothwall or IP cop into a Linksys 
WRT54Gx something (I have no desire to go back to a(nother) full PC based 
platform for my Internet firewall/router).

As most on the list are probably aware, when it comes to routers, different 
firmwares/different manufactures handle some rather transparent things like NAT 
somewhat differently.  This can raise hell with SIP (and H.323) in particular (whereas 
IAX(2) as a single port protocol is designed to work in this environment).  This trouble 
can get really ugly if you have more than one SIP device connecting out to two or 
SIP providers on the Internet; some of these routers get really confused and can't 
figure out where and when to send which packets to.  In some cases you may be 
able to use a different "non-standard" port number for the second SIP connection 
(i.e. 5061 instead of 5060), but you may also need to use a different port range (and 
port forwarding) for the RTP protocol that actually carries the voice streams (in a 
strict sense, SIP is just a signalling protocol).

Terminating multiple SIP connections one device is bad enough; terminating multiple 
SIP connections on multiple devices, especially on consumer grade products is more 
often that not going lead to major frustration if not a "train wreck".

Chad