[Freeswitch-users] Push to talk

[ik]

The only PTT SIP protocol that I know of is the following:
https://tools.ietf.org/html/rfc4964

In theory, if a phone support the P-Answer-State header, it will work.

On Fri, Dec 11, 2015 at 10:31 PM, Larry Morley <lmorley at neny.cslimits.net>
wrote:

> Mike (and anyone else who reads this):
>
> Is there a standard for PTT on SIP, either formal or ad hoc? If not, do
> you know of anywhere there's a write up of an actual or a proposed
> implementation?
>
> I'm interested in this functionality, too. We have a large public safety
> market here that makes heavy use of PTT.
>
> Also, are you aware of any SIP capable PTT handsets? And any portables
> that can carry both, for example, 800 band radio and GSM?
>
> Thanks,
> Larry Morley
>
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