The usual problem with no audio has to do with network address translation (NAT) of your external ip address and/or external port number. In the sip signalling to setup a call there sometimes can be a miscommunication of the ip address or rtp port number for the audio communication.
The usual problem with no audio has to do with network address translation (NAT) of your external ip address and/or external port number. In the sip signalling to setup a call there sometimes can be a miscommunication of the ip address or rtp port number for the audio communication.
To troubleshoot the problem I would consider enabling a STUN server. This is not the default setting for sip communication.
ITSP Profile X-->STUNEnable YES (Check)
ITSP Profile X-->STUNServer
stun.voipvoip.comWhere X is A or B depending on which profile you are using for SIP communication.
see also:
http://www.voipvoip.com/support/configuration-problem.htmlThe GoogleVoice support automatically sends a STUN server request when it initializes.