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No ringback or outgoing ringtone when calling mobile

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rsv23

rsv23

Systems Engineer
Feb 13, 2019
241
PH
We have noticed when calling a mobile number, we do not hear outgoing ringtone, we just noticed that the call is already connected when the recipient answered already.

We are using SIP line. The version is IP office 500 v2 essential edition R11.1 sp2.

 
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Often down to a SIP line set for early media when the other end isn't.

Stuck in a never ending cycle of file copying.
 
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Thank sizbut,

Is this something needs to be adjusted from IP office configuration? Or ISP side?
 
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