Caller ID name display in Cisco IP Phones

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Mar 18, 2010 6:43 AM
Mar 18th, 2010

/* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Caller ID name is sent by your telco (if you pay for the service) and this capability does not exist within CallManager. If the carrier/telco is sending the caller ID name,  it will be displayed on the IP phones.

However, if you are using H323 gateway ,and  your carrier is sending you the name on the Facility IE  Message, inbound caller name does not get displayed on the IP phone. H323 does not support Facility IE; only MGCP supports it.

These are the  possible solutions:

1. In order to allow the gateway to detect the calling name on the Facility IE please enter the following on the serial interface generated by the

pri-group statement:(which is the D channel)

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interface serialx/x/x:23
isdn supp-service name calling

2. Request the Telco to send the Calling Name Identification Delivery (CNID) as Display Information Element in the ISDN setup message


3. Configure the gateway as MGCP and register it to the CUCM.


H.323 Name Display


Calling name display information may be populated in ISDN messages in the Display Information Element (IE) of a Q.931 Setup or Notify message, or in the Facility IE of a Q.931 Setup or Facility message. The Cisco IOS gateway places this information into the same field of the corresponding H.323 message.

Cisco Unified Communications Manager (CUCM) interprets calling name information (for purposes of name display on IP phones registered with CUCM) only in the Display IE of the H.323 Setup and Notify messages. Name display information delivered in an H.323 Facility message is not interpreted by CUCM. Some ISDN switch types (for example, NI2) send a "name-to-follow" indication in the Q.931 Setup message and deliver the calling name subsequently in the Facility IE of a Q.931 Facility message. When a Cisco IOS gateway is connected to such an ISDN switch, and interoperating with CUCM using the H.323 protocol, CUCM is unable to display calling name on the IP phones.

Beginning with Cisco IOS Release 12.4(11)XW, two new modes of operation are introduced on the Cisco IOS gateways:

  • When a Q.931 Setup message with a "name-to-follow" indication is received from an ISDN switch, an H.323 Setup message with no name information is sent to CUCM. When the subsequent Q.931 Facility message is received with calling name information, it is mapped by the gateway to an H.323 Notify Display IE so that CUCM can interpret it correctly and display it on the IP Phon
  • When a Q.931 Setup message with a "name-to-follow" indication is received from an ISDN switch, the gateway can buffer the setup message until the subsequent Q.931 Facility message with calling name information is received. The name information from the Q.931 Facility message is now placed into the H.323 Setup message Display IE and sent to CUCM. If the buffer timer expires before the Q.931 Facility message is received, an H.323 Setup is sent with no name information and, if it subsequently arrives, the information is sent on using an H.323 Notify message.

This software operation is transparent to CUCM and works with all releases, although CUCM 4.2 or later is recommended.

To enable the H.323 Display feature without buffering for ISDN trunks that use the Facility message to deliver Name Display information, configure thefollowing:

At the voice service level:

voice service voip
  h323
  h225 display-ie ccm-compatible

At the voice class level:

voice class h323 1
  h225 display-ie ccm-compatible [system]

To enable the H.323 Display feature with buffering for ISDN trunks that use the Facility message to deliver Name Display information, additionally configure the following:

At the voice service level:

voice service voip
  h323
  h225 timeout ntf <50-5000>
  isdn supp-service name calling


At the voice class level:

voice class h323 1
  h225 timeout ntf <50-5000>
  isdn supp-service name calling

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