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Calling party name is not received from the PSTN or PBX


Core Issue

The calling party name is only supported across ISDN connections.


To check whether the calling name information is being received from the Public Switched Telephone Network (PSTN) and PBX, choose from one of these options:

  • For Skinny and Media Gateway Control Protocol (MGCP) gateways, follow the instructions for gathering traces as described in Set Up Cisco CallManager Traces for Cisco Technical Support and search for the string CallingPartyName=.

    If no calling party name is displayed, contact your Telco or service provider. If an error message is received after the IsdnMsgData1 is received, the calling party name may not be in the form of a Display IE and Cisco CallManager will not accept it.

  • For H.323 gateways, check if the calling name is present in the Q.931 SETUP received from the PBX or PSTN by issuing the debug isdn q931 command.

    If the calling party name is not present in the received SETUP, contact your Telco or PBX vendor. If a name is displayed in the Q.931 SETUP, but it is not in the form of a Display IE, Cisco CallManager will not accept it.

For more information, refer to Caller ID Name Delivery Issues on Cisco IOS Gateways.

Problem Type

Call connection  (Connection quality: One-way audio, no busy tone, dropped calls, etc.)

Call control software  (CallManager, CallManager Express, ICS7750, SRST, SS7 call agents)

Call Control


Call Connection

Call presentation

CallManager Features

Call presentation

Failure Type

Missing information: feature, item, file, field, number, parameter, data, settings, configuration, option, etc.

When Problem Occurs

While call is connecting

End Where Problem is Heard or Device Type Involved

IP phone

Analog phone

Call Topology and Direction

PSTN/PBX/gateway > IP network

PSTN/PBX/gateway > IP network > PSTN/PBX/gateway

IOS Debug Commands

debug voip ccapi inout

debug isdn q931

Troubleshooting Tools


Call Presentation

Calling Party Name Identification (CNID)

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