incoming calls | problem

[pedroz]

Hi.

I have the following scenario:

1. DIDww number forwarding to terrasip account (SIP)
2. Voxalot Premium with terrasip registered account
3. Sony P1i with Uniphone software with voxalot sip client

If I open the Voip client (Uniphone) in my mobile I can receive a call perfectly, the quality is quite good. However, the problem is if I leave the phone without activity for more than 30minutes the calls will start going to the voicemail.

Conclusion:
The calls are reaching the Voxalot account number, the problem is the bridge between voxalot and my mobile.

I already tried:
-Reducing the registration timeout of the SIP client
-Call forwarding rule to my voxalot account for all incoming calls
-Have STUN server with NAT no
-No STUN server and NAT yes

Any ideas?

Many thanks!