SIP in higher education

[(Dennis Baron)]

> I did try do it as you suggest, but I confirmed this doesn't work in 
> the newer firmware versions (P0S3-06-3-00, P003-07-3-00).  
> "Proxy*_address" on each line is not actually the sip proxy server 
> address, it is the domain.

Exactly.  This is a typical problem of vendors using confusing names
in their configuration schemes... at least they confuse me.  Here's
what we have working on a Cisco 79xx - we're running 5.1.0 (shame on
us!).

        domain_name : mit.edu
        image_version : "P0S3-05-1-00"
        FirmLoadID : "PC030301"
        phone_label : "617-324-8903 "
        
        line1_name : "6173248903"
        line1_authname : 
""
        line1_password : **********
        line1_shortname : "48903"
        line1_displayname : "MIT SIP Lab Cisco 7940"
        proxy1_address : "mit.edu"
        
        proxy_register : 1
        proxy_backup : "18.7.21.118"
        proxy_emergency : "18.7.21.118"
        outbound_proxy : 18.7.21.118

So I think all the *1_* fields are associated with the SIP account
assigned to "Line 1" - ie. "proxy1_address" is really "line1_domain" -
confusing!  So the SIP URI for Line 1 is made up of
line1_name@proxy1_address
 - ie. 
sip:
 .  So you'd see
something like:

     From: "MIT SIP Lab Cisco 7940" 
<sip:>

I'll guess at the last three lines above - that all SIP requests are
sent to "outbound_proxy"; with "proxy_backup" as a fallback; and
unless "proxy_emergency" is matched in the phones dial plan.  You
should be able to leave these blank and let the phone use DNS to
determine where to send the requests - but I don't know if Cisco
allows that?  You also should be able to enter a FQDN in these fields
and use DNS to specify the list of proxy addresses - but I don't know
if Cisco supports that either?

Hope this helps.  If anybody thinks I've got this wrong speak up -
it's been a while since I've played with a Cisco phone!

                  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

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