Topology: SoftPhone on WinXP @ 10.0.0.201 Asterisk on VirtualBox on this WinXP (Bridged) @ 10.0.0.211 HTC SmartPhone @ 192.118.11.112 (STUN is active) When trying to connect via GPRS, I Can see the following symptoms: 1. RTP from the SmartPhone (192.118.11.112) is not reaching the asterisk, 2. RTP from Desktop SoftPhone to 192.118.11.112 dose not heard in the SmartPhone I would add that when connecting with WiFi (same LAN) everything works fine [thanks for the STUN tip Angelos;-) ]. I attached WireShark dump in case anyone would like to take a look at. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080214/b83ff54e/attachment-0001.html -------------- next part -------------- A non-text attachment was scrubbed... Name: wireshark-dump.zip Type: application/zip Size: 133509 bytes Desc: not available Url : http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080214/b83ff54e/attachment-0001.zip