Hello, ? I have been rattling my brain and searching the mailing list for 1 week before posting. ? I?am faced with the following challenge. ? When using Xlite, all works well. When using * there is no voice either way upon off-hook?or even when redirected to voice mail(problem occurs with any VOIP provider). Ethereal trace indicates, upon?incoming call, a?request from the VOIP provider with all codecs imaginable then a request from * to the registered x-ten lite (configured as the receiving extension with silence set to transmit) with only the G -723 codec. Then a request from * to Xlite for audio over RTP 8552 and then an ok from X-lite to * for audio over RTP 8000. ? Configuration follows: ADSL direct connection to Win XP-SP2 box running Astwind, all correct ports are opened in the ICS/ICF firewalll and forwarded to the * IP. X lite registers correctly and internal calls to Voice mail are fine. sip.conf is very simple and follows X-lite sample config file. Nat is set to yes, canreinvite to no. rtp.conf?states that rtp traffic starts at 8000 ends at 65000. ? Any clue why I cannot receive/transmit voice at all via * while the Xlite works fine directly to the VOIP provider? ? Regarding Astwind, does anybody know if it supports a chipset modem 537 from intel as a card? ? Thanks.