[Freeswitch-users] Setting gateway username dynamically

Hi, I have a sip provider who requires me to set the username to be the same as the outbound caller id for the gateway (trunk) to them. Is there a way to do this dynamically for each call? e.g. <include> <gateway name="SIP-Provider"> <param name="username" value="${outbound_caller_id_number}"/> <param name="password" value="password"/> <param name="realm" value="1.2.3.4"/> <param name="proxy" value="1.2.3.4"/> <param name="expire-seconds" value="800"/> <param name="register" value="false"/> <param name="retry-seconds" value="60"/> <param name="context" value="public"/> </gateway> </include> Cheers Liam