Adding a "wait" or "pause" to a phone dial string

[SecretAgentMan]

On my Mogul (xv6800), I was able to add a "w" in the phone number dial string that would tell the phone to pause and wait for the send key to be pressed before dialing anything after the "w". I would use this to dial voicemail and then enter my voicemail number automatically after I pressed the send key once connected.

For example:
222-333-1234w*4445556789
(Where my voicemail access number is 222-333-1234, * gets you the prompt to enter your voicemail phone number, and 444-555-6789 is your phone number)

This doesn't seem to work on the Verizon TP2. I haven't been able to find anything in the forums nor in the Verizon TP2. Anybody have any idea how to get this to work?

Thanks!