Sip Signaling Session Timeout; Sip Audio Session Timeout; Alg Screen; Figure 253 Advanced > Alg - ZyXEL Communications ZYWALL 2 PLUS User Manual

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Chapter 23 ALG Screen

23.5.3 SIP Signaling Session Timeout

Most SIP clients have an "expire" mechanism indicating the lifetime of signaling sessions.

The SIP user agent sends registration packets to the SIP server periodically and keeps the

session alive in the ZyWALL.

If the SIP client does not have this mechanism and makes no calls during the ZyWALL SIP

timeout default (60 minutes), the ZyWALL SIP ALG drops any incoming calls after the

timeout period.

If no voice packets go through the SIP ALG before the timeout period (default 5 minutes)

expires, the SIP ALG does not drop the call but blocks all voice traffic and deletes the audio

session. You cannot hear anything and you will need to make a new call to continue your

conversation.

Click ADVANCED > ALG to open the ALG screen. Use the ALG screen to turn individual

ALGs off or on and set the SIP timeout.

If the ZyWALL provides an ALG for a service, you must enable the ALG in order

to perform bandwidth management on that service's traffic.

Figure 253 ADVANCED > ALG

ZyWALL 2 Plus User's Guide