[Freeswitch-users] Extension does not ring after some time

Steven Ayre steveayre at gmail.com
Fri Apr 18 18:16:47 MSD 2014

> do you think is a client problem or server

NAT routers need to keep a list of UDP connections open to know the
internal/external ports to map between and what connections are open to
allow the replies through the firewall. Since there's no explicit
disconnect in UDP it relies exclusively on timeouts to remove old
connections from the table when no longer in use, to prevent the mapping
table becoming full.

Once it's removed from the table the router is no longer going to know the
internal client to send the INVITE from the server to, which could be why
you stop receiving the call on the client. From the server's perspective it
probably times out.

Either side sending packets (eg keepalives) will keep the connection
'recently active' and therefore the mapping open.

Check the SIP trace on FreeSWITCH (sofia global siptrace on). See if the
phone gives a response to the INVITE. If the phone gives a reply it's
getting through the NAT and so that's not the issue. If you get no reply
it's highly likely it is the NAT router.

can you suggest me a value?

The best value is going to depend on the router - on what timeout value it
has, how large the table is, and how many connections you have open through

30s is probably a good setting to go. You can tweak it up/down from there
if need be.

On 18 April 2014 14:48, Mr.Gab <crazygabry at gmail.com> wrote:

> Sean Devoy <sdevoy at ...> writes:
> >
> > Have you tried to turn on NAT Keep Alive on the client?
> >
> can you suggest me a value? :) do you think is a client problem or server
> problem?
> Thank you
> crazygabry
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