1. this will depend on how you want to configure your system ie if you have 4 digit extensions then it is easier to have the phone company forward 4 digits and as such have an easier config without the need for extra translation patterns etc
3. The phone company allways receive all digits including code ie 0123456789, the only difference you can make is whether to show the extension full DDI number or the main number of the site. ie 01234 124444 where 4444 is the extension number or 01234 120000 where this is the main number on the PSTN cct.
1. Id prefer the 4 digit forward from the phone company, as I also thought that would be easier. But, if the phone company decides to send 7 instead, would the translation pattern be something like this:
123XXXX (XXXX being the extension?) forwarded to XXXX ?
There are various ways to configure the translation pattern: one way you can use it to use 123.XXXX and then use the "discard pre-dot" in the called-party transformation window.
Depending on how you've configured the PRI you may have other alternatives. If, for example, you're connecting it using MGCP you can use the "inbound: significant digits" attribute to ensure only 4-digits will be delivered.
Hope the new year finds you well! Just wanted to add a little note to the great info from Gonz, David and Stu. I did work for the local Telco here for a number of years and the request for the number of Digits sent is extremely common. This is by no means a huge change for them to make (to send you 4-digits) so they should be very accomodating when you make the Change Order.
These type of changes should also be a zero dollar reque$t :)
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