CIsco Unity Connection 7.0
Siemens PBX is connected to cisco router using E1 line. This router is configured as h.323 gateway in CUCM. Two way calling between Cisco & Siemens is working fine. If user calls voice mail pilot number from Siemens phone, user gets voice mail prompt. But PIN entered by user from siemens phone is not accepted by Cisco setup.
Is some configuration is required on router or CUCM so that DTMF works between CIsco & Siemens.