Context
During voice calls between SIP users, the unified gateway receives and processes only call control signaling streams, and does not receive or process media streams that carry communication contents. If an IP terminal engaged in a call is powered off unexpectedly, the transmission of media streams stops, but the IP terminal does not send call end signaling to the involved unified gateway. As a result, resources of the system control module fail to be released in time. After the SessionTimer function is enabled on the unified gateway and all IP terminals, the unified gateway periodically detects the session status of SIP users to ensure that the above-mentioned system resources are released in time.
Procedure
- Enable the SessionTimer function on the unified gateway.
config modify sip parameter usesessiontimer yes
- Enable the SessionTimer function on an IP phone.
The eSpace 7950 IP phone is used as an example. If other types of IP phones are used, refer to the corresponding IP phone documents.
- Log in to the web management system of the IP phone.
- Choose , enable SIP Session Timer, and set the detection period, as shown in Figure 1.Figure 1 Enabling the SessionTimer function on an IP phone
- Click Save and restart the IP phone as prompted.
- Enable the SessionTimer function on an IAD.
- Log in to the web management system of the IAD.
- Choose , and set Session timer to On, as shown in Figure 2.Figure 2 Enabling the SessionTimer function on an IAD
- Click OK and save the setting.
