We have 3 PSTN lines for outgoing call and the TA410 is connected with asterisk. When the 3 PSTN lines are busy we hear the Busy Tone from TA410. We want to hear the busy tone from PBX instead the busy tone from TA410.
I mean we want want to hear the Voice Prompt from PBX instead of the TA410 Busy Tone when are PSTN lines are busy for outgoing call.
the firmware version of TA410 is 220.127.116.11
About PBX version
Elastix v4 - Asterisk 11.21.0
Please your help.
Thanks & Best Regards,