# Bandwidth Management - What Features are Supported?

Call Admission Control (CAC) cannot be applied in all cases, for example, a call placed on hold can always be retrieved. The following list identifies features that will always be allowed to connect.

### Features Exempt from Call Admission Control

- ACD Calls

- Add Held

- Attendant Serial Call

- Call Park - Original Attendant Hold

- Call Waiting Swap

- Call Park

- Call Pickup

- Call Pickup - Clustered

- Campon - Call Waiting

- DSS/ BLF

- Emergency Services

- Fax calls (See Note below)

- Group Page

- Hold Retrieve (Hard Hold, Hold on Hold)

- Loudspeaker Paging

- Music - Background

- Music on Hold

- Non-Busy Station

- Override

- Recall

- Record-a-Call

- Silent Monitor

- Stack Hold

- TAFAS

- Transfer

- Wakeup Calls

NOTE: Fax calls are admitted even if they exceed the programmed bandwidth limits between zone access points. The reason for this is timing. CAC does not know at the time that it decides whether or not to admit the call which audio codec will be used to encode the fax transmission. Thus, a fax call between two switches that starts out using a G.711 codec (which consumes 88 kbytes of bandwidth), will be allowed through even when the bandwidth limit between the switches is 32 kbytes.

Related Topics

- Introduction

- About Zones and ZAPs

- About Call Admission Control

- Configuration Data is Shared via SDS