[VoiceOps] Cisco 7940 PTT

Scott Berkman scott at sberkman.net
Sun Nov 15 23:43:54 EST 2009

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.


-----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


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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