I've got an issue with SIP trunking on outgoing call in os7030 .

I have OS 7030 V4.53b , The pbx behind Linksys router,with following license :


2 MGI license
2 SIP trunk license

The following ports are forwarded
to the ip of the pbx:

30000--30031
5060
9000
9001
6100

In Incoming call on the SIP trunk,I can receive call successfully
without any problem with voice .

But when i try to make outgoing call on the SIP trunk, The
"opposite hangup " Message appears on the Digital phone screen .

Note that, I can make outgoing call successfully When i use same account with ATA .

I need your help to solve this problem?