Figure 268 Policy > Voip Passthru; Table 131 Policy > Voip Passthru - ZyXEL Communications ZyWALL 1050 User Manual

ZyWALL 1050 User's Guide
Figure 268 Policy > VoIP Passthru
The following table describes the labels in this screen.
Table 131 Policy > VoIP Passthru
LABEL
Enable SIP
Transformations
SIP Media
inactivity time
out
SIP Signaling
inactivity time
out
Additional SIP
Signaling port
(UDP) for
transformations
Enable H.323
transformations
Apply
Cancel
418
DESCRIPTION
SIP is a signaling protocol used in VoIP (Voice over IP), the sending of voice signals
over Internet Protocol. Turn on the SIP ALG to allow SIP sessions to pass through
the ZyWALL.
Using the SIP ALG allows you to use bandwidth management on SIP traffic.
Use this field to set how many seconds (1~86400) the ZyWALL will allow a SIP
session to remain idle (without voice traffic) before dropping it.
If no voice packets go through the SIP ALG before the timeout period expires, the
ZyWALL deletes the audio session. You cannot hear anything and you will need to
make a new call to continue your conversation.
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, the ZyWALL deletes the signaling session after the timeout
period. Enter the SIP signaling session timeout value (1~86400).
The ZyWALL's SIP ALG operates on UDP port 5060 traffic by default. If you are
using SIP on another port number, enter the port number here.
H.323 is a protocol used for audio communications over networks.
Select this check box to turn on the H.323 ALG to allow H.323 sessions to pass
through the ZyWALL.
Using the H.323 ALG allows you to use bandwidth management on H.323 traffic.
Click Apply to save your changes back to the ZyWALL.
Click Cancel to begin configuring this screen afresh.
Chapter 26 VoIP Pass Through