asterisk users - Aug 2009 - transfer two gsm mobile calls

Hello:

when using any fct or sip to gsm gateway, is possible to transfer an
incomming call to another number automatically from asterisk

say

incoming call (gsm gateway)
answer;
mobile user dial 0XXXXXXX
then retention 4 SEND KEY
then dial XXXXXXX
then xxxxx answer
then recover first call 4 send key
then transfer 2 send key...

my question is how can you emualte send key to gsm gayeway , is it device
dependant

tanks
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