[Freeswitch-users] Hide outbound trunk prefix from A-Leg

Hi I have simple scenario with FS bridging internal user with external SIP provider With SIP provider we agreed on tech prefix to distinguish between "service levels" Let's say trunk prefix is 9999 and user dials number 500500500 The problem is that when a local user is calling, he dials 500500500, the call is bridged to SIP provider with prepended tech prefix. After the call is established user will see on his softphone that the call is established with number 9999500500500 This creates some confusion, since they dialed number without prefix How can we hide the outbound call prefix and show the A-leg user only the number he dialed?