I have request to use speed-dial to extension in other company.

So once the user of IP phone press the speed-dial button the call should be forwarded to PSTN then >>> PBX >>> exact extension.

I am planing to do this using comma in the pots dial-peer.like:

destination-pattern 123456789,,,,,555

in this case the main number of other party is 123456789

then delay for 5 seconds

then dial the extension 555

I just need to know if anybody can share me better solution?