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Subject: SIP in higher education

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Re: [] Re: Cisco 7960 and Avaya CCS 2.1 registration problem

Chronological Thread 
  • From: Stephen Kingham <>
  • To:
  • Cc: Steve Blair <>
  • Subject: Re: [] Re: Cisco 7960 and Avaya CCS 2.1 registration problem
  • Date: Fri, 28 Jan 2005 13:57:51 +1100


Dennis Baron wrote:

Is this the configuration you use with your SER proxy?
If so do your IP phone users have the ability to do extension dialing
between themselves and/or other on campus non-IP phones? If they
do how many digits are in your extensions and how did you implement
this in SER?

We're running SIPxchange and not SER. But yes, SIP accounts all have
a five digit alias, and usually a email alias, for the ten
digit SIP user. The dial plan supports both five digit dialing to the
PBX and 9+ dialing to the PSTN via the PBX. Plus just about
everything else that you can dial on the PBX.

I support the same on SER. I do that by using rewrite rules in the ser.cfg.

At the start of processing any INVITES I check if it is an E.164. If it is I convert the various Dial Plans into the full international DialPlan including the +. Then as I process ACL (long distance baring), ALIAS table, and Routing number ranges to various Gateways I only deal with one dial plan. The user can think they are at home, on a PBX extension, etc, and use the Dial Plan they are use to, internally my routing and barring etc only deals with one dialplan.

Then optionally for some users I convert using the ALIAS table all the contacts for a user (including calls to their hard phone and PBX phone and Cell phone numbers) to their SER username. I Then use static entries in the Location Table to send calls to that user's PBX extn, Cell Phone, and of course any UAs. So the user can have parallel forking.

PS This stuff is hard to describe with just text ;-(.




Dennis Baron; Information Services & Technology
Senior Strategist for Integrated Communications
Massachusetts Institute of Technology; Room E19-738 tel:+1-617-252-1232
77 Massachusetts Avenue; Cambridge, MA 02139-4307 fax:+1-617-253-8000


Stephen Kingham, MIT, BSc, E&C Cert
Project Manager and Consulting Engineer mailto:
Telephone +61 2 6222 3575 (office)
+61 419 417 471 (mobile)

Voice and Video over IP
for The Australian Academic Research Network (AARNet)

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