SIP in higher education

[Steve Blair <>]

Candace:

 Right. For example. Say your phone config file has an
entry proxy1_address: harvard.edu. The phone boots,
checks it's tftp server for a config file. Downloads the
file and uses _sip._udp.<proxy1_address> as an SRV
service name. It attempts to resolve this into an A record
or CNAME.

 In your case this works. If it were to fail then the phone
fails over to a certain DNS "lookup" sequence. I forget
what the sequence is but I think it is SRV, A, CNAME.

 It repeats this process for each phoneX_config entry
in the phone configuration file.

 I'm not sure if this helps

_Steve

Candace Holman wrote:

> Yul,
>
> 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.  I.e., for domain we use harvard.edu, you 
> use hawaii.edu, Dennis uses mit.edu, - these are the domains but not 
> the sip proxy server addresses.
>
> Steve Blair's answer indicates that the DNS SRV (_sip._udp.bigu.edu) 
> is what the phones use to find the sip proxy server address.
>
> Candace
>
> At 06:12 PM 1/26/2005, Yul Pyun wrote:
>
> > Candace,
> >  
> > Proxy server address is settable in three ways:
> > 1) Manually configure it for each of the line, using the 79x0 phone's 
> > keypad
> >  
> > 2) Set the Proxy1_address field in the SIPmac-addr.cnf file (probably 
> > in your TFTP server's sip_phone sub-directory) with the server's 
> > dotted IP address or FQDN
> >  
> > 3) Set the Proxy1_address field in the SIPDefault.cnf file (probably 
> > in your TFTP server's root directory) with the server's dotted IP 
> > address or FQDN
> >  
> > hth,
> > -Yul
> >
> >     ----- Original Message -----
> >     From: Candace Holman 
> > <mailto:>
> >     To: 
> >
> >  
> > <mailto:>
> >     Sent: Wednesday, January 26, 2005 12:26 PM
> >     Subject: [sip.edu] Re: Cisco 7960 and Avaya CCS 2.1 registration
> >     problem
> >
> >     Thanks Venky, Joseph, and others from Avaya.  Although there is
> >     no way to change the domain and realm on the Cisco endpoint, I
> >     did get it to register after changing the proxy address from the
> >     address of the sip proxy to the address of the domain. 
> >
> >     This may seem like a strange question - how is the phone getting
> >     the address of the sip proxy in order to register?  Is it from
> >     the SRV record in DNS?
> >
> >     Candace
> >
> >     At 11:56 PM 1/21/2005, Venkatesh Krishnaswamy wrote:
> >
> > >         Candace,
> > >         Please see below for why you might be seeing the
> > >         registration problem.
> > >
> > >         Venky Krishnaswamy
> > >         Director, IP Communications Research,
> > >         Avaya Labs, Avaya Inc.
> > >         Lincroft, NJ 07738
> > >         
> > >
> > >  
> > > <mailto:>
> > >
> > >         -------- Original Message --------
> > >         Subject: RE: [Fwd: [sip.edu] Cisco 7960 and Avaya CCS 2.1
> > >         registration problem]
> > >         Date: Fri, 21 Jan 2005 23:42:51 -0500
> > >         From: Mastrogiulio, Joseph (Joseph)
> > >         
> > > <>
> > >  
> > > <mailto:>
> > >         To: Krishnaswamy, Venkatesh (Venkatesh) 
> > > <>
> > >         
> > > <mailto:>,
> > >  Walker, William J (William)
> > >         
> > > <>
> > >  
> > > <mailto:>
> > >         CC: Zenner, Hal B (Hal) 
> > > <>
> > >         
> > > <mailto:>
> > >
> > >
> > >         Venky,
> > >
> > >          
> > >
> > >         The registration is failing because the proxys domain and
> > >         realm is harvard.edu, and the endpoint is registering into
> > >         the mysipserver.harvard.edudomain.  Notice that in the
> > >         WWW-Authenticate header of the 401 response from the proxy
> > >         the realmand domainvalues are both set to harvard.edu.  This
> > >         tells me that the proxy is configured with harvard.eduas
> > >         domain and realm.  The REGISTER request from the endpoint
> > >         specifies a mysipserver.harvard.eduas the domain.  The
> > >         mismatch in domains is causing the registration to fail.
> > >
> > >          
> > >
> > >         Make sure that the endpoint is configured with the same
> > >         domain and realm as the proxy.  Also, make sure that the CCS
> > >         user and the phone are configured with the same password. 
> > >         However, this particular registration would fail because of
> > >         domain mismatch.  So, reconfigure the endpoint with
> > >         harvard.edudomain and realm and the registration should succeed.
> > >
> > >          
> > >
> > >         Joseph
> > >
> > >          
> > >
> > >          
> > >
> > >         -----Original Message-----
> > >         From: Krishnaswamy, Venkatesh (Venkatesh)
> > >         Sent: Thursday, January 20, 2005 5:08 PM
> > >         To: Walker, William J (William); Mastrogiulio, Joseph (Joseph)
> > >         Cc: Zenner, Hal B (Hal)
> > >         Subject: [Fwd: [sip.edu] Cisco 7960 and Avaya CCS 2.1
> > >         registration problem]
> > >
> > >          
> > >
> > >         Bill, Joseph:
> > >         I came across this in the SIP.edu mailing list. Is the
> > >         configuration that they're talking about supported? If so -
> > >         any idea what the problem could be?
> > >         Venky
> > >
> > >
> > >         -------- Original Message --------
> > >
> > >             Subject:
> > >
> > >         [sip.edu] Cisco 7960 and Avaya CCS 2.1 registration problem
> > >
> > >             Date:
> > >
> > >         Thu, 20 Jan 2005 16:36:57 -0500
> > >
> > >             From:
> > >
> > >         Candace Holman 
> > > <>
> > >         
> > > <mailto:>
> > >
> > >             Reply-To:
> > >
> > >         
> > >
> > >  
> > > <mailto:>
> > >
> > >             To:
> > >
> > >         
> > >
> > >  
> > > <mailto:>
> > >
> > >          
> > >
> > >
> > > Hi,
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > I'm getting errors trying to register a Cisco 7960, firmware P0S3-06-3-00 
> > >
> > >
> > >
> > > with an Avaya CCS, version 2.1.0.0-35   There's a continuing auth 
> > >
> > >
> > >
> > > problem.  The exchange of messages is listed below.  Does anyone see the 
> > >
> > >
> > >
> > > problem here?
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > <REGISTER sip:mysipserver.harvard.edu SIP/2.0
> > >
> > >
> > >
> > > Via: SIP/2.0/UDP myphoneipaddr:5060;branch=z9hG4bK29d84d0b
> > >
> > >
> > >
> > > From: 
> > > sip:
> > >  
> > > <>
> > >
> > >
> > >
> > > To: 
> > > sip:
> > >  
> > > <>
> > >
> > >
> > >
> > > Call-ID: 
> > >
> > >  
> > > <mailto:>
> > >
> > >
> > >
> > > CSeq: 227 REGISTER
> > >
> > >
> > >
> > > User-Agent: CSCO/6
> > >
> > >
> > >
> > > Contact: 
> > > <sip:80550@myphoneipaddr:5060>
> > >
> > >
> > >
> > > Content-Length: 0
> > >
> > >
> > >
> > > Expires: 3600
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > > , length=<357>
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > <SIP/2.0 401 Unauthorized
> > >
> > >
> > >
> > > From: 
> > > sip:
> > >  
> > > <>
> > >
> > >
> > >
> > > To: 
> > >
> > >
> > >
> > > sip:;tag=2C520912BDEF99F3DFFAD3DE1F6F188A110625677410312
> > >  
> > > <;tag=2C520912BDEF99F3DFFAD3DE1F6F188A110625677410312>
> > >
> > >
> > >
> > > Call-ID: 
> > > 003094c3-18c20002-237f53c2-2ff10850@myphoneipaddr
> > >
> > >
> > >
> > > CSeq: 227 REGISTER
> > >
> > >
> > >
> > > Via: SIP/2.0/UDP myphoneipaddr:5060;branch=z9hG4bK29d84d0b
> > >
> > >
> > >
> > > Content-Length: 0
> > >
> > >
> > >
> > > WWW-Authenticate: Digest 
> > >
> > >
> > >
> > > realm="harvard.edu",domain="harvard.edu",nonce="MTEwNjI1Njc3NDpTREZTZXJ2ZXJTZWNyZXRLZXk6MTUzMzk0MDgxNw==",algorithm=MD5
> > >
> > >
> > >
> > > Server: Avaya Converged Communications Server
> > >
> > >
> > >
> > > Organization: harvard.edu
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > > , length=535
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > <REGISTER sip:mysipserver.harvard.edu SIP/2.0
> > >
> > >
> > >
> > > Via: SIP/2.0/UDP myphoneipaddr:5060;branch=z9hG4bK4f5a0744
> > >
> > >
> > >
> > > From: 
> > > sip:
> > >  
> > > <>
> > >
> > >
> > >
> > > To: 
> > > sip:
> > >  
> > > <>
> > >
> > >
> > >
> > > Call-ID: 
> > > 003094c3-18c20002-237f53c2-2ff10850@myphoneipaddr
> > >
> > >
> > >
> > > CSeq: 228 REGISTER
> > >
> > >
> > >
> > > User-Agent: CSCO/6
> > >
> > >
> > >
> > > Contact: 
> > > <sip:80550@myphoneipaddr:5060>
> > >
> > >
> > >
> > > Authorization: Digest 
> > >
> > >
> > >
> > > username="80550",realm="harvard.edu",uri="sip:mysipserver.harvard.edu",response="cb7a0f964021ad9d60c5e312e887b17a",nonce="MTEwNjI1Njc3NDpTREZTZXJ2ZXJTZWNyZXRLZXk6MTUzMzk0MDgxNw==",algorithm=MD5
> > >
> > >
> > >
> > > Content-Length: 0
> > >
> > >
> > >
> > > Expires: 3600
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > > , length=<571>
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > <SIP/2.0 500 Internal Server Error
> > >
> > >
> > >
> > > From: 
> > > sip:
> > >  
> > > <>
> > >
> > >
> > >
> > > To: 
> > >
> > >
> > >
> > > sip:;tag=2C520912BDEF99F3DFFAD3DE1F6F188A110625677410314
> > >  
> > > <;tag=2C520912BDEF99F3DFFAD3DE1F6F188A110625677410314>
> > >
> > >
> > >
> > > Call-ID: 
> > > 003094c3-18c20002-237f53c2-2ff10850@myphoneipaddr
> > >
> > >
> > >
> > > CSeq: 228 REGISTER
> > >
> > >
> > >
> > > Via: SIP/2.0/UDP myphoneipaddr:5060;branch=z9hG4bK4f5a0744
> > >
> > >
> > >
> > > Content-Length: 0
> > >
> > >
> > >
> > > Organization: harvard.edu
> > >
> > >
> > >
> > > Server: Avaya Converged Communications Server
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > > , length=398
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > =====================================================================
> > >
> > >
> > >
> > > Candace Holman
> > >
> > >
> > >
> > > 617-384-6665
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Harvard University Information Systems
> > >
> > >
> > >
> > > 60 Oxford Street
> > >
> > >
> > >
> > > Cambridge, MA 02138