asterisk users - Dec 2005 - Exceptionally long queue in SIP Channel

Hi,

Started getting a bombardment of these messages on the Asterisk console this
morning (20+ a second):

Dec 14 10:00:30 WARNING[17006]: channel.c:588 ast_queue_frame:
Exceptionally long queue length queuing to SIP/bluecity29-a5cfDec 14
10:00:30 WARNING[17006]: channel.c:603 ast_queue_frame: Unable to write
to alert pipe on SIP/bluecity29-a5cf, frametype/subclass 5/0 (qlen 173842):
Resource temporarily unavailable!

Had to restart Asterisk to get rid of them. Has anybody seen this before?

Aaron