[Serusers] Prefix from the To user to the from user

[Ibrahim Hamouda]

Hi all
	This is my first post to the list, so I hope I can get some help.

	Here is the scenario.

	I'm building a SER server 0.9.6 with the following characteristics.

	I'll be supporting different companies with multiple locations each.

	The phone number will be 7 digits.

	First 2 digits are the company, the following 2 digits are the
branch or location and the last 3 digits are the user number.

	So, let's say companyA digits are 21, and companyB digits are 22.
	CompanyA has two branches 10 and 11.

	Branch 10 has a user 100 (full number in subscriber table is
2110100), and a user 101 (full number in subscriber table is 2110101)
	Branch 11 has a user 100 (full number in subscriber table is
2111100).

	CompanyB has a branch 10 and user within the branch 100 (full number
in subscriber table is 2210100)

	I want user when dialing within the same branch to be able to dial
the other user number only. User 2110100 can dial 100 to reach User 2110101.

	But if he wants to dial User 2111100 (Same company different branch)
he can dial 11100.

	And if he wants to dial a user within another company he has to dial
the full 7 digits.

	No to SER config

	If ser receives a 3 digits number in the $ruri, it should extract
the first 4 digits from the From URI and prefix the $ruri/username with
them.
	If ser receives a 5 digits number in the $ruri, it should extract
the first 2 digits from the From URI and prefix the $ruri/username with
them.

	My problem is how to extract the first 2 or first 4 digits from the
from URI.

	Any ideas?


Thanks in advanced for your help, I have spent 5 days now trying to figure
this one out.

Ibrahim Hamouda