SIP in higher education

[Stephen Kingham <>]

Hi

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 SIP.edu 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 ;-(.

Stephen

>                          Dennis
>
> =========================================================================
>
> Dennis Baron; Information Services & Technology     
> mailto:
> Senior Strategist for Integrated Communications        
> sip:
> 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)
sip:

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