The "original" Cisco phones (7940, 7960, 7905, 1912) that have official SIP support have never had any advanced features (namely subscribe, presence, answer-after, etc) to the public SIP firmware. Some of these features are supported with varyingly proprietary SIP functions on the CCM SIP versions of the Firmware. Using these with other platforms is possible, but is neither supported or documented in any official capacity. You can find some basic instructions out there if you feel like wasting a lot of time on the project, but I'm not sure that all of the functions have ever really been figured out from a provisioning standpoint. That being said, PTT is possible on any phone with the right feature platform in some manner. For instance, BroadSoft implements PTT outgoing using a star code, which could be auto answered by a different phone that does have support for the answer-after tag. A PTT call to one of these devices would just ring in like any other call however. The Cisco/Linksys/Sipura SPA series of phones has a similar design and a much more full list of supported features. There is also a new line of Cisco multi-media phones (9X00) that may or may not have this type of support, but does advertise SIP interoperability with "partner" platforms. I don't know much about them beyond that. -Scott -----Original Message----- From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org] On Behalf Of Alex Balashov Sent: Thursday, November 12, 2009 9:51 PM To: Ujjval Karihaloo Cc: voiceops at voiceops.org Subject: Re: [VoiceOps] Cisco 7940 PTT No. -- Sent from mobile device On Nov 12, 2009, at 9:30 PM, Ujjval Karihaloo <ujjval at simplesignal.com> wrote:
Can a Cisco 7940/7960 do Push to Talk..any config suggestions?
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