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Cannot transfer calls between two analog pbx extensions via cisco Phone

frank3333
Level 1
Level 1

Hi All,

Calls from Analog PBX to CUCM Cisco phone cannot transfer back to another analog extension in same PABX (no voice)

Exten 1 (PABX A)--->Cisco Phone (CUCM)--> Extension 2 (PABX A)

Exten 2 can pick the calls originating from exten1 and transfer via Cisco phone but call connected with no voice.

Exten 1 (PABX A)--->Cisco Phone (CUCM) ----OK

Cisco Phone (CUCM)--> Extension 2 (PABX A) ---OK

Exten 1 (PABX A)--->Cisco Phone (CUCM)--> Extension 2 (PABX A) --- No voice between ext1 and ext 2.

 

Need help to resolve this.

Thanks.

3 Replies 3

Divina Vitorino
Level 1
Level 1

Frank, follow some questions

 

How PBX are connected?

Is there a trunk between then?

 

Which manufacturer is?

 

Please check if you have MTP configured.

Hi Divina,

PBX configured via sip trunk and manufacture is Teltronics.

I didn't checked MTP required on trunk configuration and want to know how to configure MTP.

Thanks.

Frank, please follow this guide. 

 

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_5_1/ccmsys/accm-851-cm/a05mtp.html

 

At Device > Gateway you need to enter your gateway (that is the other PBX) and see if media termination point required option is checked.

 

 

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