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Does Cisco SPA7940/7941 IP Phone works with third party open SIP server?

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Does Cisco SPA7940/7941 IP Phone works with third party open SIP server?
Answer
9/10/10 9:50 AM
Hello Cisco experts,
 
We are manufacturer of SIP Call Manager. Our customers are highly demanding Cisco 7940/7941 IP-Phones to work with our SIP call manager.
I would like to know if Cisco 7940/7941 IP Phones support firmware for standard SIP interface (RFC 3261 and others)?
If not, what is the way to integrate 7940/7940 IP Phones with third party SIP call manager?
 
-Vivek Batra  
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RE: Does Cisco SPA7940/7941 IP Phone works with third party open SIP server
Answer
9/23/10 8:38 PM as a reply to Vivek Batra.
Hi,
 
AFAIK, integration of 7940 IP Phones with third party SIP call manager is possible. I believe, you would have to use SIP/MGCP firware version of IP phones to achieve this.
 
Further reference on this from http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7960g_7940g/mgcp/firmware/matrix/frmwrup.html
 
The Cisco IP Phone 7960 and 7940 platform has the ability to support three protocol application firmware versions:
>SCCP - Used with Cisco Call Manager.
>SIP - Used with Cisco SIP Proxy Server (CSPS), base transceiver station (BTS), third-party servers, or as a standalone entity.
>MGCP - Used with third-party call agents (CAs).
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