Also, to get the SIP very well as well, SIP uses both TCP/UDP 5060 right? and why are there recommendations of opening 5000-5082 UDP for SIP along with 5060 TCP? Are there any "niceties" to that as well? maybe video transmission stuff?
Thanks again, On Fri, Jan 14, 2011 at 4:12 PM, Bruce B <bruceb...@gmail.com> wrote: > Got it. Thanks. Makes sense to keep an extra two in mind for conference > etc.... > > Off topic - what is top post? I am using gmail + chrome - no ugly Outlook. > > > On Fri, Jan 14, 2011 at 3:33 PM, Danny Nicholas <da...@debsinc.com> wrote: > >> Hurray for Microsoft Outlook (for creating this whole top-post thread). >> Just my .02; The other two ports must have been a remnant of another >> channel; as for the 4 ports – I think that the 4 port requirement is >> probably for “niceties” like conferencing and transfers. >> >> >> ------------------------------ >> >> *From:* asterisk-users-boun...@lists.digium.com [mailto: >> asterisk-users-boun...@lists.digium.com] *On Behalf Of *Bruce B >> *Sent:* Friday, January 14, 2011 2:15 PM >> >> *To:* Asterisk Users Mailing List - Non-Commercial Discussion >> *Subject:* Re: [asterisk-users] Why are 4 ports used for a single call? >> >> >> >> Thanks guys. I am not sure whether that call was asymmetric or not but I >> saw 4 ports open. It could be that the other two ports were remnant of >> another channel even though I doubt it. >> >> >> >> Now, when I tried again, it is only 2 ports that is opened like you >> mentioned, even RTP port, and RTP port +1. So, does Asterisk usually use >> the symmetric method or is the asymmetric method used as well by some media >> servers? >> >> >> >> The reason why I am asking is because there are many many >> online responses that there is 4 ports needed per call and make sure you >> keep enough ports open, blah blah... >> >> >> >> Thanks again >> >> On Fri, Jan 14, 2011 at 2:57 PM, Gary Allen <solsta...@gmail.com> wrote: >> >> RTP always uses a random even numbered port, then RTCP will use the next >> port, which will always be odd numbered. Symmetric RTP only needs two >> ports, while asymmetric RTP uses four. >> >> http://www.armware.dk/RFC/rfc/rfc4961.html >> >> >> On Fri, Jan 14, 2011 at 12:44 PM, Bruce B <bruceb...@gmail.com> wrote: >> >> I mean part of RTP RFC? >> >> >> >> On Fri, Jan 14, 2011 at 2:41 PM, Bruce B <bruceb...@gmail.com> wrote: >> >> Hi Everyone, >> >> >> >> I am just tweaking a pfSense router and learning lots about NAT etc....I >> noticed that each call uses four UDP port for RTP. Here is an example of >> port for a call I made: >> >> >> >> 10200 >> >> 10201 >> >> 10504 >> >> 10505 >> >> >> >> Seems like they are random in pair. I have a restriction of 10000-11000 in >> my rtp.conf so that makes sense. But why use 4 ports per call? is that part >> of SIP RFC? >> >> >> >> Thanks >> >> >> >> >> >> -- >> _____________________________________________________________________ >> -- Bandwidth and Colocation Provided by http://www.api-digital.com -- >> New to Asterisk? Join us for a live introductory webinar every Thurs: >> http://www.asterisk.org/hello >> >> asterisk-users mailing list >> To UNSUBSCRIBE or update options visit: >> http://lists.digium.com/mailman/listinfo/asterisk-users >> >> >> >> >> -- >> _____________________________________________________________________ >> -- Bandwidth and Colocation Provided by http://www.api-digital.com -- >> New to Asterisk? Join us for a live introductory webinar every Thurs: >> http://www.asterisk.org/hello >> >> asterisk-users mailing list >> To UNSUBSCRIBE or update options visit: >> http://lists.digium.com/mailman/listinfo/asterisk-users >> >> >> >> -- >> _____________________________________________________________________ >> -- Bandwidth and Colocation Provided by http://www.api-digital.com -- >> New to Asterisk? Join us for a live introductory webinar every Thurs: >> http://www.asterisk.org/hello >> >> asterisk-users mailing list >> To UNSUBSCRIBE or update options visit: >> http://lists.digium.com/mailman/listinfo/asterisk-users >> > >
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