<p dir="ltr">Bob,</p>
<p dir="ltr">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.</p>
<p dir="ltr">Thanks.</p>
<p dir="ltr">Larry</p>
<div class="gmail_quote">On Dec 14, 2015 12:00, "Bob Hartwig" <<a href="mailto:bobjectsfreeswitch@gmail.com">bobjectsfreeswitch@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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.</div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Dec 14, 2015 at 10:37 AM, ik <span dir="ltr"><<a href="mailto:idokan@gmail.com" target="_blank">idokan@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">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. </p>
<p dir="ltr">When done, there is an hangup, until some try to talk. </p><div><div>
<div class="gmail_quote">On Dec 14, 2015 6:11 PM, "Bob Hartwig" <<a href="mailto:bobjectsfreeswitch@gmail.com" target="_blank">bobjectsfreeswitch@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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.<div><br></div><div>Bob</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Dec 13, 2015 at 6:38 PM, Larry Morley <span dir="ltr"><<a href="mailto:lmorley@neny.cslimits.net" target="_blank">lmorley@neny.cslimits.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Hi Bob</p>
<p dir="ltr">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?</p>
<p dir="ltr">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.</p>
<p dir="ltr">Is that along the lines of what you're suggesting, or am I completely missing the mark?</p>
<p dir="ltr">Thanks,<br>
Larry<br>
</p><div><div>
<div style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Why not just use re-INVITEs with a=sendrecv and a=recvonly?<div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Dec 13, 2015 at 2:26 AM, ik <span dir="ltr"><<a href="mailto:idokan@gmail.com" target="_blank">idokan@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>The only PTT SIP protocol that I know of is the following:<br><a href="https://tools.ietf.org/html/rfc4964" target="_blank">https://tools.ietf.org/html/rfc4964</a><br><br></div>In theory, if a phone support the P-Answer-State header, it will work.<br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Fri, Dec 11, 2015 at 10:31 PM, Larry Morley <span dir="ltr"><<a href="mailto:lmorley@neny.cslimits.net" target="_blank">lmorley@neny.cslimits.net</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><p dir="ltr">Mike (and anyone else who reads this):</p>
<p dir="ltr">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?</p>
<p dir="ltr">I'm interested in this functionality, too. We have a large public safety market here that makes heavy use of PTT.</p>
<p dir="ltr">Also, are you aware of any SIP capable PTT handsets? And any portables that can carry both, for example, 800 band radio and GSM?<br></p>
<p dir="ltr">Thanks,<br>
Larry Morley</p>
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