Re: SV: [pfSense Support] sip nat

Thu, 19 Mar 2009 19:56:33 -0700

Paul,
you want my pap2 version 2?  I unlocked it from vonage and i get a terrible delay.  Cant seem to get rid of the delay so it makes the device kinda worthless.  unless you know how to get rid of the delay,  i dont want it ;)

Chris Flugstad
Cascadelink
900 1st ave s, suite 201a
seattle, wa 98134
p: 206.774.3660 | f: 206.577.5066
[email protected]


Paul Mansfield wrote: 
Chris Buechler wrote:
  
On Wed, Mar 18, 2009 at 9:44 PM, Chris Flugstad <[email protected]> wrote:
    
Also forgot to note, that most phones will register on port 5060.  This
however behind a NAT wont work if you have more than 1 phone.  You will have
to statically configure the port different on each port OR someone phone
will have a "random" port selection OR sometimes you can select 5061 and it
will pick a random port.
      
Or this is what the siproxd package is for, to be able to track
connections on SIP where you can't rewrite the source port. That's
almost always, but evidently there are some scenarios where that works
fine, given the report of the initiator of this thread.
    

Indeed, I've found that you simply can't get multiple SIP devices behind
a simple-minded NAT box without hacking their advanced configuration to
run on different ports. Snag is some devices, e.g. Siemens S685IP dect
voip+pbx phone, don't reliably allow fine-grained control of SIP settings.

In the end I set up a small linux firewall with siproxd and then I
was able to use a whole mix of Linksys PAP2T/SPA2002 and Siemens S685IP
without issue. Set them up on a dedicated voice VLAN, add traffic
prioritisation rules on the firewall and it works pretty well even over
a domestic but good quality ADSL service.


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