[Freeswitch-users] Push to talk

[Bob Hartwig]

PTT just means selectively muting and unmuting calls based on a switch
closure or UI events, right?  I know that some commercial conference
systems implement muting by reinviting with a=sendonly, so if you're
designing an end instrument that does PTT, it seems reasonable to implement
that by reinviting with a=recvonly.  Or if you're implementing the PTT
functionality on the server side, use a=sendonly.  Just spitballing here,
I've never needed to do this.

Bob



On Sun, Dec 13, 2015 at 6:38 PM, Larry Morley <lmorley at neny.cslimits.net>
wrote:

> 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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>
>
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>
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>
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