[asterisk-users] chan_zap problems

[equis software]

Hi, I have Asterisk 1.4.0 using Queue App.
I use PRI connecting my Asterisk with Siemens EWSD
This was working OK but since two days I have this error:

[Jun 22 10:53:09] WARNING[8050] chan_zap.c: Ring requested on channel 0/3
already in use on span 1.  Hanging up owner.
[Jun 22 10:53:09] WARNING[8050] chan_zap.c: Ring requested on channel 0/3
already in use on span 1.  Hanging up owner.
[Jun 22 10:53:14] WARNING[8050] chan_zap.c: Ring requested on channel 0/3
already in use on span 1.  Hanging up owner.
[Jun 22 10:53:15] WARNING[8050] chan_zap.c: Ring requested on channel 0/3
already in use on span 1.  Hanging up owner.
[Jun 22 10:53:15] WARNING[8050] chan_zap.c: Ring requested on channel 0/3
already in use on span 1.  Hanging up owner.

I the EWSD try to send a call in this channel I hear a busy tone.
In the others channels asterisk answer ok.
And when it happends only restarting Asterisk I can fix the error, it
happends two times a day.

Thanks
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