Polycom DOC2702A User Manual

Polycom RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide 

Polycom, Inc.

When the system flag SEND_SIP_BUSY_UPON_RESOURCE_THRESHOLD is set to YES 

(NO is the default), it enables the RMX to send a busy notification to a SIP audio endpoint or 

a SIP device when dialing in to the RMX whose audio resource usage exceeded the Port 

Usage threshold.
The RMX will send a SIP busy response to SIP audio endpoints when: 
•

The system flag SEND_SIP_BUSY_UPON_RESOURCE_THRESHOLD is set to YES 

(NO is the default)

•

 The port usage threshold for Audio resources is exceeded. The threshold is defined in 

the Setup > Port Gauge dialog box.

When the flag is set to YES, the system will allow SIP audio endpoints to connect to the 

MCU until the Port Usage threshold is reached. Once this threshold is exceeded, the SIP 

audio endpoints will not be able to connect, ensuring that the remaining system resources 

can be used by all other connections, including SIP video, H.323 cascaded links and ISDN 

video. When the call is rejected by the MCU because of lack of resources, the appropriate 

indication will be sent by the MCU to the SIP audio endpoint.
For example, if the Port Gauge threshold is set to 80%, when 80% of the Audio resources are 

used, the system will not allow additional SIP audio endpoints to connect and will send a 

busy notification to the endpoint.
This does not affect the video resources usage.