asterisk users - Jan 2004 - Meetme sound dropped ? Out of trunk data space ??

Hi,

While I was in a conference call just now all parties experienced a
temporary sound drop (about 2 seconds)

The console said:
Jan 16 13:10:47 WARNING[190505]: chan_iax2.c:2497 iax2_send: Out of trunk
data space on call number 16385, dropping
Jan 16 13:10:47 WARNING[192554]: chan_iax2.c:2497 iax2_send: Out of trunk
data space on call number 16386, dropping
Jan 16 13:10:48 WARNING[186408]: chan_iax2.c:2497 iax2_send: Out of trunk
data space on call number 16384, dropping

There were three members in the conference, all coming in through an IAX2
trunk. There is an E100P in this box.

What is happening ?

Florian