[Asterisk-Users] Cut off after 8 secs?? Help

[tucker]

Call comes in from remote SIP, authorised, does the following and dies

Any idea why..

I have ports 5060 and 16384 to 16482 open

Do I need any others?

What am I missing

Remote user is using X-lite for windows..
 
    -- Executing Dial("SIP/2004-944c", "SIP/2001|20") in new stack
    -- Called 2001
    -- SIP/2001-4f3b is ringing
    -- SIP/2001-4f3b answered SIP/2004-944c
    -- Attempting native bridge of SIP/2004-944c and SIP/2001-4f3b
Jul  5 19:04:17 WARNING[-224801872]: chan_sip.c:497 retrans_pkt: Maximum
retries exceeded on call
FC7F4A8C-3CC8-42C6-BF13-892EA5CC6503 at 192.168.1.100 for seqno 24922
(Response)