From: schaefer@alphanet.ch   
      
   Fred Atkinson  wrote:   
   >         The issue is that [when I answer an incoming call on one of my VOIP   
   > extensions] it takes fifteen to twenty seconds after I answer before I can   
   > hear the calling party.  When this happens, the other extensions keep ringing   
   > [even though I have answered the incoming call] until I can hear the caller.   
      
   Assuming SIP protocol:   
      
   If you could record the IP packets, for example with tcpdump or   
   Wireshark (available also on Microsoft software), you may see something   
   like this: an attempt to RE-INVITE the session on a private IP address.   
      
   If you have this option on your IP phone, try to disable reinvitation.   
      
   This may, or may not, be the problem, but a Wireshark capture (first a   
   simple PNG capture of the exchange, with sip in the filter area,   
   then sip || udp, would help).   
      
   >         The same is true when I make an outgoing call, it is fifteen to   
   twenty   
   > seconds after the called party answers before they can hear me.   
      
   This looks like: SIP session establishment work, but the RTP / UDP audio   
   path does not work immediately.   
      
   What SIP phone do you use?   
      
   Did you try another SIP provider?   
      
   Do you have special SIP NAT traversal options on your router?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)