So if you don't talk, how does the girl know which way you want to be talked to?
Ask your friend for my friend 
Ah good question! Just called my friend ( not silently) and he said:
1) Send and AW email requesting the type of service, as you would for a visit

You need to be clear on the time, duration and detail. Something like 'talk dirty to me at 8pm tonight' not going to cut it.
Need to state if want a slow build up, posh/common accent and abuse or ego boost and what turns you on.
E.g 'I want you to tell me how hot I am, how wet I'm making you hearing me breathe and got fingers in both holes etc etc' or 'Look you little twat get busy rubbing that inch long knob and don't dare speak as your voice makes me want to puke you fucked up asshole' ok?
2) Call at arranged time but make sure your prepared, comfy, phoned charged and tissue at the ready. Lock the dog away

3) Bingo ya done!
Don't know why my friend told me all that detail and kept me silent whilst he went on and on...wanker