"William Stillwell (Lists)" writes: > I have several remote phones that experience a slight call delay when > answering phones, ie, they will answer, speak a few words, and then the > remote caller will hear them, and the first half is cutoff?
This is actually a somewhat common problem in SIP. One end sends media before the other end is ready to receive it, or a gateway receives media on one leg of the call but media isn't yet ready on the other leg... In your case I would guess that it is caused by firewalls/NAT reacting only to RTP traffic in one direction, thereby blocking traffic in the other until the first packet. Luckily it's IP, so you can use tcpdump or wireshark or phone-specific dump tools to capture the traffic and see where the problem hides. /Benny
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