[Freeswitch-users] Push to talk

[ik]

It's more then that.  You open a new channel, and instead of 180/3 you send
200, and then one side hears, while the other side talk.

When done, there is an hangup, until some try to talk.
On Dec 14, 2015 6:11 PM, "Bob Hartwig" <bobjectsfreeswitch at gmail.com> wrote:

> 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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