Thanks Rich, but i'm only allowed to use g729. you said that some folks run high latency connections, but is 300ms high in my setup?
On 3/19/06, Rich Adamson <[EMAIL PROTECTED]> wrote: > Erick Perez wrote: > > Hi, we have set up a small project in a school the following way: > > SITE_A(4 port analog to ip > > g729)------ADSL_ISP1-------ISP2--------Asterisk-----PSTN > > Site A has 1 Megabit of bandwith (up 512kilobit down 1 megabit) > > The asterisk box gets internet service via a wireless antenna. 1 Mbit > > of up/down bandwith > > > > Comments: > > So far, this means that I will need licenses for the 729. > > asterisk only supports 20ms sampling on g729 so 4 channels will need > > 96 kilobits at 20ms sampling (or is it kilobytes??) for the internet > > bandwith. > > i cannot use CRTP because i cant be sure if the ISP's routers are CRTP > > aware. > > Installing ADSL from ISP1 on the asterisk place will give a clear advantage > > > > Please correct any of my prior statements if wrong. > > > > should I maintain packet latency below 300ms or 150ms? > > The objective should be to keep latency as low as possible, however some > folks do run asterisk via satellite which as a very lengthy latency. > > > How can I measure this latency all the way to the asterisk? > > Several ways depending on how accurate a measurement you want. A simple > ping would give a starting point. A much more expensive way is to use > VoIP analysis software to measure it, but be prepared to spend at least > $1,500 (US) to do that. > > > Should I ping from SITE_A to the asterisk box with 8k packets? > > If you want to emulate a sip/iax packet, use a packet size of about 200 > bytes. > > > If I can't install ADSL for the moment, will the above setup work? > > Probably a bigger issue to address relates to what "other" traffic might > be passing across the dsl and/or wireless channel that might be > consuming bandwidth and impacting the rtp packets. Broadcasts > originating from devices outside your control (other isp users), hackers > attempting to access your ip addresses (at both ends), data traffic > between your two endpoints, etc, are just some thoughts of items using a > portion of the bandwidth available. > > Might also think about jitter (eg, variations in latency) and what that > might do to your end to end communications. > > There are other low bandwidth codecs available that could be used > instead of g729. Some include ilbc, g726, gsm, etc. Each consumes > different bandwidths, and each provide a slightly different quality of > audio. See the wiki for more detail on what each consumes for bandwidth > on the wire. > > > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > Asterisk-Users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > -- ------------------------------------------- Erick Perez Linux User 376588 http://counter.li.org/ (Get counted!!!) Panama, Republic of Panama _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users