Originally Posted by mach123

Thank you for all the information and immediate response. Basically this was a trunk configuration problem between the InterVoice and InterTel system. InterTel's implementation of E&M does not allow for hook-flash from the Intervoice system. Instead, the InterTel system was configured as OPX single line (all extensions were placed into a hunt group). The intervoice side was configured as loop start thus allowing for all hookflashes to work correctly and the transfers to go through successfully.