[Serusers] Stripping and prefixing

[Nair]

hi,

can anyone guide me in techprefixing.

for eg: how can i prefix 911 to 16509647244 and send 
91116509647244 to PSTN gw.

and when some one dials in 811146509647245, how can i
strip "811" and send 146509647245 to PSTN gw.

how can i have dialing plan for the both senarios.

thanks in advance.

regards,


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