I installed ITSP trunk in OS4K V7 and it is working fine.
the original extension numbers are from 1000 to 4999
the SIP trunk range is from 224 9100 to 9199
The extension numbers has to change to 9xxx series
but customer dont want to change the series.
with FUFUM Commad we use to map the DID range with the physical number
that is
9100 to 1000 For example
If I dial 2249100 the call landing in extension 1000
but i am unable to call out because the ITSP wont allow the extension range other than 9xxx.
so it is mecessary to map the DOD number also.
if i am dialling from extension 1000 ,the ITSP has to recive the caller iD 2249100.
but ITSP recieving caller ID is 2241000 and it is out of range and it wont allow.
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