[Freeswitch-users] Push to talk

[Larry Morley]

Hi Bob

Are you suggesting something along the lines of putting the callee's set -
or sets belonging to members of s group - on hold after sending the initial
INVITE? Or putting each group member's set on hold and leaving a call up -
but on hold - until a caller leaves a group?

So long as each set has two or more lines, normal calling should work, too:
each user would have their regular extension and an extension that's
dedicated to PTT type calls.

Is that along the lines of what you're suggesting, or am I completely
missing the mark?

Thanks,
Larry
Why not just use re-INVITEs with a=sendrecv and a=recvonly?



On Sun, Dec 13, 2015 at 2:26 AM, ik <idokan at gmail.com> wrote:

> 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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>
>
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