Strange behavior of chanspy

I have configured in my extensions that he can listen the conversations of other users or extensions, but when I try to mark the chanspy extension in a telephone linksys spa 942, in this I don’t listen anything of other telephones gandstream gxp 2000 and bt 200 I don’t have problems


Executing [05112@cyber:1] ChanSpy(“SIP/116-08233448”, “SIP/112|bq”) in new stack
== Spying on channel SIP/112-08231a38
[Nov 24 01:43:23] NOTICE[4452]: app_chanspy.c:202 start_spying: Attaching SIP/116-08233448 to SIP/112-08231a38