[Asterisk-Users] IP Phones and firewalls ...

[Brian Watters]

Hello all,

Here is our problem .. 

IP SIP phones remote ..

They will connect to our IP PBX (Asterisk Server) without issue however no
voice makes it when anyone answers a phone call made by one of these IP
phones.

So this means SIP is working but RTP is not, Here is what I currently have
on the firewall (http://m0n0.ch/wall).

Firewall Rules

TCP/UDP  *  *  192.168.2.253  5060  NAT SIP Protocol     
UDP  *  *  192.168.2.253  4569  NAT IAX Protocol     
UDP  *  *  192.168.2.253  5036  NAT IAX Protocol     
UDP  *  *  192.168.2.253  10000 - 20000  NAT RTP UDP  

NAT Rules

WAN  TCP/UDP  5060 - 5099  192.168.2.253  5060 SIP Protocol      
WAN  UDP  4569  192.168.2.253  4569  IAX2 Protocol      
WAN  UDP  5036  192.168.2.253  5036  IAX Protocol      
WAN  UDP  10000 - 20000  192.168.2.253  10000 - 20000  RTP UDP Range  

IP phones are Sipra 841's and work great when on the same subnet as the *
server, this only becomes an issue when offnet and of course outside of the
firewall.

So I am stumped as to why this does not work .. I have logging turned on for
all of the above and see no packets getting dropped .. Anyone there able to
shead some light on this .. 


Brian