<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">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">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><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><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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