Sip trunks on oxe cant register

[haroun]

I READ THIS and not finish all what you write or seen CAV post

I have been able to establish calls to and from the OXE behind the firewall after some routing and port openings made by the firewall maintainer but there is NO audio both ways on the calls..

first think come to my head YES :SBC

[tot3nkopf]

Or maybe the router is ALG SIP aware and needs to be configured.

[marcin99]

if sip is behind NAT you have to:
1. configure destination or static NAT for sip port from provider ip to pbx ip
2. enable sip alg if is disabled
3. configure static nat for rtp from provider to voice card ip for inbound calls
2. configure source nat