[asterisk-users] Using Queue - Zap problems (PRI)

[equis software]

I have asterisk 1.4 using Queue application.
I have this error I must restart Asterisk to correct it.
Any Ideas??

log:
[Jun 20 16:42:27] WARNING[29339] channel.c: Unexpected control subclass '17'
[Jun 20 16:42:38] NOTICE[29337] app_queue.c: No one is answering queue
'myqueue' (13/12/0)
[Jun 20 16:44:16] WARNING[30203] file.c: Failed to write frame
[Jun 20 16:45:11] WARNING[8044] chan_zap.c: Ring requested on channel 0/2
already in use on span 1.  Hanging up owner.
[Jun 20 16:45:20] WARNING[8044] chan_zap.c: Ring requested on channel 0/2
already in use on span 1.  Hanging up owner.
[Jun 20 16:45:27] WARNING[8044] chan_zap.c: Ring requested on channel 0/2
already in use on span 1.  Hanging up owner.
[Jun 20 16:45:31] WARNING[8044] chan_zap.c: Ring requested on channel 0/2
already in use on span 1.  Hanging up owner.
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