No ringback tone over SIP trunk with Phone is forwarded

[sat.datos.mdtel]

Hi,

I have a CUCM cluster 7 connected to ISP.through SIP trunk

When I make a outgoing call from a IP phone through SIP trunk the call is fine but if I forward the IP Phone (forward all) to a external number and I call from PSTN to that forwarded Phone, I don´t heard ring back tone.

Can you help me, please?

[Ayodeji Okanlawon]

Hi,

Can you send us CUCM SDI traces. Please ensure that your trace level is set to detailed.

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[clemente]

Hi,

did you solve this one?

I'm having the same issue.

Thanks!