[Freeswitch-users] Push to talk

[Larry Morley]

Bob,

Thanks for taking the time to suggest that. While what you suggested might
not be the magic bullet as far as a PTT system goes, it certainly seems to
be the jumping off point for a different application I've been part
contemplating and part messing with, on and off, for a while now.

Thanks.

Larry
On Dec 14, 2015 12:00, "Bob Hartwig" <bobjectsfreeswitch at gmail.com> wrote:

> Oh OK, completely disregard my suggestion then.  I thought we were talking
> about a long-established multi-party conference with selective unmuting of
> end instruments.
>
> On Mon, Dec 14, 2015 at 10:37 AM, ik <idokan at gmail.com> wrote:
>
>> 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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