[Freeswitch-users] Selective problem with outbound calls

JT Bock jtbock at synacktics.com
Fri Nov 27 17:58:58 MSK 2015


Replying to my own post...

I swapped out an upstream switch/router/firewall with a different brand, 
and the problem went away.  I don't know why this issue appeared with 
1.6, but my guess is that it had something to do with the UPNP feature 
on the residential class Cisco router.

On 11/25/2015 10:12 PM, JT Bock wrote:
> Hi,
> Hoping someone might have some insight...
> I currently have a Debian 7 system (freeswitch 1.4) with Aastra 6731i
> phones and a single Polycom 335. Everything works fine.
> I built a Debian 8 system (freeswitch 1.6) as a drop-in replacement.
> Inbound calls work fine on the 2 different brands of phones (Aastra, and
> Polycom), but the Aastra phones cannot make outbound calls. Or rather,
> they can, but there is no audio. Outbound calls via the Polycom work
> fine.  I did packet captures when making an outbound call with each type
> of phone, and when using the Aastra phones, there is no response
> received by the FS box after the Invite.
> I literally unplug the Debian 7 system and plug in the Debian 8 system.
> They are identically IP'ed, same SIP and RTP ports, etc.  I can move the
> Debian 8 box to e.g. my home network, and then the Aastra phones work fine.
> So, it seems this is some kind of firewall/nat problem, but why would
> the Polycom still work? Is there some configuration parameter on the
> Aastra phones I should look at?
> Any thoughts appreciated.
> Thanks,
> Tim
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