[Freeswitch-users] Rewriting media address in SDP as well as contact IP/port

[Steven Ayre]

>
> configuring endpoints to use a particular port for RTP and
> then forwarding a range of ports for each endpoint


Guessing this is how you're working around the fact the external RTP port
won't be the same as the internal one through most NAT implementations.

Seems an awful lot of work to go to when it'd be easier to configure a
client correctly (assuming they support NAT correctly). A lot of work for
you to setup and maintain, and that won't scale well.

If the clients can't support NAT correctly you could try using the SIP ALG
on the NAT router (if available) which should rewrite the RTP IP/port
automatically. Usually the advice is to disable that and let FS & the
client handle the NAT (because generally it just causes more problems if
you're handling the NAT twice). But in the bypass_media case it might help.
Does mean you can't use TLS though (since the router can't see inside the
encrypted packets), and it'll probably only spot SIP on port 5060.

-Steve





On 21 November 2012 20:11, PhilQ <philq at qsystemsengineering.com> wrote:

> configuring endpoints to use a particular port for RTP and
> then forwarding a range of ports for each endpoint
>
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