[asterisk-users] Problem using Android SIP-Client

Luca Bertoncello lucabert at lucabert.de
Tue Oct 24 13:06:35 CDT 2017

Harel Cohen <harel at mayorcom.com> schrieb:

> Is the Sophos a home router or professional one? In many cases what home

Of course the professional firewalls (we have two Sophos in Cluster, to
manage our two SDSLs)

> router does by default needs to be configured manually on professional one.
> E.G. a home router will allow outgoing sessions and create a return path by
> default where professional one won't.
> Two things I would look for:
> 1. Look for, and disable, ALG for SIP. The idea of ALG is nice but I
> haven't encountered a device that implements this properly (I'm not a
> network expert so it doesn't mean that there isn't such a router out there).
> 2. On the Sophos try to statically open the UDP port range of your RTP to
> outgoing traffic from your phone to your SIP server. Note that outgoing
> port range is what your SIP server defines as its port range, not your
> phone. If you get one way voice (remote hears phone) then you are on the
> right direction. You'll then need to open the incoming ports too for the
> ports that your phone is expecting to get its RTP from.

OK, tomorrow I'll check it...

Luca Bertoncello
(lucabert at lucabert.de)

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