Pass DID to SIP tie trunk

I did forget to increment. Fixed it, calls now route, but still sending "s" as the DID.

[2015-12-19 15:28:36] VERBOSE[1931] pbx.c: -- Executing [s@custom-RouteToShoretel:2] Macro("SIP/vite-inbound-00000008", "dialout-trunk,4,s,,") in new stack