How to configure Freeswitch gateway.

As FreeSWITCH allows you to place XML configuration almost anywhere you will need to decide where you wish to place your gateway configuration.
It is suggested to place a file called thinktel.xml under conf/sip_profiles/external/

In a default configuration, the <gateway> head tag exists in the main sip configuration file just before the external directory include statement.

<gateway name=""> # replace as required
<param name="username" value="XXXYYYZZZZ"/> # your SIP authentication username
<param name="realm" value=""/> # replace as required
<param name="password" value="@@@@@@@@"/> # your SIP authentication password
<param name="expire-seconds" value="3600"/>
<param name="register" value="false"/> # registration is not required/supported
<param name="caller-id-in-from" value="true"/>
<param name="ping" value="30"/> # will mark the gateway down if it cannot be pinged

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