The University of Texas at Austin
As part of the Web Central Services Retirement project, the ITS website will be retired. Information about IT services will be replaced by two new sites, IT@UT and UT ServiceNow, and ITS departmental information will be migrated to a new location. All changes will be completed by 7/28/2016.

Telephone Service (Retirement in Progress)

Custom Calling Features (CCF): Make Set Busy (MSB or MSBI)

The MAKE SET BUSY feature allows you to make your telephone appear busy to all callers without taking the telephone off hook; incoming callers will hear a busy signal. The telephone will ring for a short burst (splash ring) at the beginning of each call to remind you that the feature is activated. You can use the telephone to make calls while the feature is activated. MSB works for all calls whether from campus or from off campus. MSBI (MAKE SET BUSY-INTRAGROUP) works only for calls from other stations on the UT telephone system.

What You Do What You Hear
1) Lift handset. Dial Tone
2) Dial the activation code "*72". Confirmation Tone
You are on an established call:
1) Hookflash. Stutter Dial Tone
2) Dial the activation code "*72". Confirmation Tone
To Cancel
1) Lift Handset. Dial Tone
2) Dial the deactivation code "*73". Confirmation Tone


  • RING AGAIN requests will be returned to a station even when MAKE SET BUSY is activated.

  • RING AGAIN attempts against a telephone with MAKE SET BUSY activated will be blocked. The caller will hear a busy signal after dialing the RING AGAIN activation code.

  • MAKE SET BUSY can apply to all calls (MSB) or internal campus calls only (MSBI). Specify your preference when you order the feature for your phone.

  • Given a telephone assigned MAKE SET BUSY for UT calls only, and also CALL WAITING, outside calls will activate the CALL WAITING tone and can be answered. UT calls will not activate the CALL WAITING and will receive a busy signal. You cannot answer the second call and the calling party will hear a busy signal.

  • Even though you hear a short burst of ringing (splash ring) when a call is made to your line, you cannot answer a call when MAKE SET BUSY is activated.

  • A standard electromechanical (1A2) key system will not generate a splash ring unless the timing is changed on the line cards.

Last updated May 3, 2012 @ 11:21 am

We Can Help

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* UT Service Desk

* Call us at 512-475-9400

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