Hi all,
I'm using VOIPJET to make international calls with an IAX2 connection
between my local asterisk server and their server(s).
At times I seem to have a problem if 5 or more international calls are made
at once - I'm on a 1024kbps download and 256kbps upload DSL line (only the
asterisk server uses this DSL line). Today I switched the codec from ulaw
to ilbc in an attempt to lower the bandwidth requirements.
I have read many times that IAX2 has a signaling overhead (30 or 40kbps?)
and then every channel uses the codec bandwidth.
Does Asterisk automatically know to use one overhead bandwidth management
for IAX2 remote peer gateways? I'm afraid of the possibility that I have
not configured the VOIPJET IAX2 link correcty and that I'm making lots of
single connections to them and thus duplicating the IAX2 overhead bandwidth
requirement for every call? I don?t know though - The next steps are to 1)
hear back for you ;) and 2) put in mrtg bandwidth logging to get an idea of
my usage.
I have VOIPJET setup as a peer in iax2.conf and then my extensions.conf dial
command just looks like: exten => _00.,2,Dial,IAX2/xx@voipjet/011${EXTEN:2}
; Make Call - (In Ireland we use 00 as the International prefix but US
people (and VOIPJET) like 011 as the international dial prefix)
I'd be very keen to hear from anyone who has knowledge on using IAX2 to
route multiple outgoing calls.
Thanks very much,
Derek Conniffe
PS I notice that if three international calls are being made and I run
"iax2
show channels" at the CLI prompt I can see three IAX2 channels being shown:
Channel Peer Username ID (Lo/Rem) Seq (Tx/Rx)
Lag Jitter JitBuf Format
IAX2/voipjet/1 216.118.117.46 xx 00001/00004 00148/00150
00120ms 0016ms 0064ms ilbc
IAX2/voipjet/2 216.118.117.46 xx 00002/00081 00130/00126
00150ms 0054ms 0065ms ilbc
IAX2/voipjet/3 216.118.117.46 xx 00003/00071 00230/00232
00120ms 0015ms 0065ms ilbc
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On Sat, 15 Jan 2005 19:58:15 -0000, Derek Conniffe <derek@rivertower.ie> wrote:> I have read many times that IAX2 has a signaling overhead (30 or 40kbps?) > and then every channel uses the codec bandwidth.This is true if you are using IAX2 trunking. This can be enabled with trunk=yes in your peer configuration. The other end must also support the trunking as well.> Does Asterisk automatically know to use one overhead bandwidth management > for IAX2 remote peer gateways? I'm afraid of the possibility that I have > not configured the VOIPJET IAX2 link correcty and that I'm making lots of > single connections to them and thus duplicating the IAX2 overhead bandwidth > requirement for every call? I don't know though - The next steps are to 1) > hear back for you ;) and 2) put in mrtg bandwidth logging to get an idea of > my usage.It does not do it automatically. As I mentioned previously, you must enable it via the trunk command. Having never used VoipJet however, I'm not sure if they allow it or not. I would assume that if they are using Asterisk they would want it enabled? Your next step should be to turn on something like Ethereal or tethereal (or tcpdump, etc..) and just look at the network traffic. Filter it for IAX2 traffic and just look to see what is going on. If you've never used it, LEARN IT!!!> I have VOIPJET setup as a peer in iax2.conf and then my extensions.conf dial > command just looks like: exten => _00.,2,Dial,IAX2/xx@voipjet/011${EXTEN:2} > ; Make Call - (In Ireland we use 00 as the International prefix but US > people (and VOIPJET) like 011 as the international dial prefix)You should be able to set it up so that you have a peer definition in your iax.conf file and use the provider like so: exten => _9NXXNXXXXXX,1,Dial(IAX2/provider/${EXTEN:1}) <-- note that the "provider" should be replaced with whatever you name the peer definition in iax.conf. HTH, Leif Madsen. http://www.leifmadsen.com
On Sat, 15 Jan 2005 19:58:15 -0000, Derek Conniffe wrote:>Hi all, > >I'm using VOIPJET to make international calls with an IAX2 connection >between my local asterisk server and their server(s). > >At times I seem to have a problem if 5 or more international calls are made >at once - I'm on a 1024kbps download and 256kbps upload DSL line (only the >asterisk server uses this DSL line). Today I switched the codec from ulaw >to ilbc in an attempt to lower the bandwidth requirements.It makes perfect sense that you have such troubles. Using G.711 each call will use 64k on each leg, thats 64k inbound and outboard. With overheads I've seens this often averages up to 80k per leg. 64k x 5 = 320k outbound 80k x 5 = 400k outbound You don't have enough bandwidth. Your switch ti iLBC should take care of this, although that cost of some call quality. I too use VoipJet. I've been very happy with their service. I upgraded my DSL to 768k upload in order to get around just the bandwidth issue that you have seen. Michael>I have read many times that IAX2 has a signaling overhead (30 or 40kbps?) >and then every channel uses the codec bandwidth. > >Does Asterisk automatically know to use one overhead bandwidth management >for IAX2 remote peer gateways? I'm afraid of the possibility that I have >not configured the VOIPJET IAX2 link correcty and that I'm making lots of >single connections to them and thus duplicating the IAX2 overhead bandwidth >requirement for every call? I don?t know though - The next steps are to 1) >hear back for you ;) and 2) put in mrtg bandwidth logging to get an idea of >my usage. > >I have VOIPJET setup as a peer in iax2.conf and then my extensions.conf dial >command just looks like: exten => _00.,2,Dial,IAX2/xx@voipjet/011${EXTEN:2} >; Make Call - (In Ireland we use 00 as the International prefix but US >people (and VOIPJET) like 011 as the international dial prefix) > >I'd be very keen to hear from anyone who has knowledge on using IAX2 to >route multiple outgoing calls. > >Thanks very much, > >Derek Conniffe > >PS I notice that if three international calls are being made and I run "iax2 >show channels" at the CLI prompt I can see three IAX2 channels being shown: > >Channel Peer Username ID (Lo/Rem) Seq (Tx/Rx) >Lag Jitter JitBuf Format >IAX2/voipjet/1 216.118.117.46 xx 00001/00004 00148/00150 >00120ms 0016ms 0064ms ilbc >IAX2/voipjet/2 216.118.117.46 xx 00002/00081 00130/00126 >00150ms 0054ms 0065ms ilbc >IAX2/voipjet/3 216.118.117.46 xx 00003/00071 00230/00232 >00120ms 0015ms 0065ms ilbc > >--- >Outgoing mail is certified Virus Free. >Checked by AVG anti-virus system (http://www.grisoft.com). >Version: 6.0.809 / Virus Database: 551 - Release Date: 09/12/2004 > > >_______________________________________________ >Asterisk-Users mailing list >Asterisk-Users@lists.digium.com >http://lists.digium.com/mailman/listinfo/asterisk-users >To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > >-- Michael Graves mgraves@pixelpower.com Sr. Product Specialist www.pixelpower.com Pixel Power Inc. mgraves@mstvp.com o713-861-4005 o800-905-6412 c713-201-1262