<include>
  <gateway name="sip.provider.com">
  <param name="realm" value="sip.provider.com"/>
  <param name="username" value="username"/>
  <param name="proxy" value="8.8.8.8"/>
  <param name="password" value="123456"/>
  <param name="expire-seconds" value="3600"/>
  <param name="register" value="true"/>
  <param name="register-transport" value="udp"/>
  <param name="retry-seconds" value="600"/>
  <param name="caller-id-in-from" value="true"/>
  <param name="extension-in-contact" value="true"/>
  <param name="ping" value="25"/>
  <param name="cid-type" value="rpid"/>
  <param name="rfc-5626" value="true"/>
  <param name="reg-id" value="1"/>
  </gateway>
</include>