<gateway name="gateway012">
   <param name="realm" value="sip.voipcarrier.com" />
   <param name="username" value="WBrandes" />
   <param name="password" value="myvoiceismypassword" />
   <param name="register" value="true" />
   <param name="caller-id-in-from" value="true" />
   <param name="ping" value="5" />
   <param name="ping-max" value="3" />
   <param name="retry-seconds" value="5" />
   <param name="expire-seconds" value="60" />
   <variables>
     <variable name="verbose_sdp" value="true"/>
     <variable name="absolute_codec_string" value="PCMU,PCMA" direction="outbound"/>
     <variable name="customer_id" value="3532" direction="inbound"/>
   </variables>
 </gateway>