Have you tried using the MGCP protocol on the GW itself without any additional hardware? http://www.cisco.com/en/US/products/hw/univgate/ps501/products_data_sheet09186a0080091b55.html MGCP and TGCP MGCP 1.0 is a protocol for centralized control of VoIP calls by external call-control elements known as media gateway controllers (MGCs) or call agents. MGCP is described in the informational RFC 2705, published by the IETF. The Cisco AS5350 Universal Gateway includes support for the MGCP network access server (NAS) package. This allows the platform to operate simultaneously as a network access server and a voice gateway to deliver universal port services in an MGCP network. Standards-based T.38 Fax Relay and RFC 2833 DTMF Relay are available with MGCP. The Cisco AS5350 also supports the PacketCable Trunking Gateway Control Protocol (TGCP) 1.0. PacketCable is an industry-wide initiative to develop interoperability standards for multimedia services over cable facilities using packet technology. CableLabs developed the TGCP protocol, which contains extensions and modifications to MGCP while preserving the basic MGCP architecture and constructs.
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It looks like with the 00 it is actually only going to take those digits and then do nothing with the rest of the digits. With the T - it may be working properly for you, but the T says take all digits with out limiting them, BUT, there is a 15 second wait after entering the digits. If you do want to test the T try pressing # after entering your digits.or you could use "00........" I could be wrong, but give that a shot..
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