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.htmlMGCP and TGCPMGCP 1.0 is a protocol for centralized control of VoI...
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 secon...