3.17.6 User to user balance transfer

<listener type="sip">

  <param name="ipaddr" value="1.2.3.4" />

  <param name="port" value="5061" />

  <param name="transport" value="tls-tcp" />

  <param name="tls-certificate" value="VPS.cert" />

</listener>

<listener type="registrar">

  <param name="ipaddr" value="1.2.3.4" />

  <param name="port" value="5061" />

  <param name="register-expiration" value="3600" />

  <param name="subscribe-expiration" value="3600" />

  <param name="transport" value="tls-tcp" />

</listener>