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If you want to perform a PAT (Port Address Translation) in addition to the NAT, then please use this option to explain to the appliance which port number is used on the external interface for providing the encrypted SIP service.
2.4.
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5.1 Keep-alive Frequency
If you are using the keep-alive option (please refer to PSOM 1.0 Accounts and Groups) then you may find this option handy. You can define here how many seconds should pass between each keep-alive request sent by the server to each client configured with the keep-alive option.
| Note |
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Please keep in mind that the default keep-alive timeout is 60 seconds and thus it can lead to a quick battery drain since the radio system on the mobile device could never be idled. |
If any mobile user has been configured with the keep-alive option on, then we strongly suggest you to set the keep-alive Frequency to 180 seconds (i.e. 3 minutes) at least in order to save battery life.
| Tip |
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| This option is the same as the qualifyfreq one in the standard Asterisk configuration. |
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