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643

Configuring SIP session refresh

Introduction to SIP session refresh

In a high-volume traffic environment, if a BYE message gets lost for a session, the call proxy server will not

know that the session has ended. Therefore, it still maintains the state information for the call, which

wastes resources of the server. To solve this problem, the RFC 4082 defines a session timer mechanism

for SIP sessions: the UA sends periodic re-INVITE or UPDATE requests (called session refresh requests) to

notify the proxy server about the current state of the session. The interval for sending session refresh

requests is determined through the negotiation of both sides.

Two new header fields are added to the session refresh requests:

• Session-Expires—Conveys the maximum session duration, that is, if no refresh request is received

during this time, the session is considered ended.

• Min-SE—Conveys the minimum session duration, which is used to avoid frequent refresh requests

from occupying network bandwidth.

Configuring SIP session refresh

Select Voice Management > Call Connection > SIP Connection from the navigation tree, and click the

Session Properties tab to access the SIP session refresh configuration page, as shown in Figure 665.

Figure 665 SIP session ref

resh configuration page

Table 247 Configuration items

Item Descri

tion

SIP Session Refresh

• Enable—Enable SIP session refresh.

• Disable—Disable SIP session refresh.

You can configure Session Expiration and Min Session Refresh Interval only after

the SIP session refresh function is enabled.

Session Expiration Maximum and minimum session durations of SIP sessions.

By default,

• The periodic refresh of SIP sessions is not enabled automatically. That is, if

periodic refresh of SIP sessions is disabled on the called party but enabled on

the calling party, the called party will enable periodic refresh of SIP sessions

after negotiation.

• The minimum session duration is 90 seconds.

Min Session Refresh

Interval

Configuring compatibility

Select Voice Management > Call Connection > SIP Connection from the navigation tree, and click the

Session Properties tab to access the compatibility configuration page as shown in Figure 666.

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