Connecting Your Enterprise With Asterisk: IAX to Carriers. Dayton Turner Voxter Communications
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1 Connecting Your Enterprise With Asterisk: IAX to Carriers Dayton Turner Voxter Communications
2 What is IAX? Inter Asterisk exchange Developed by Digium and the Open Source Community Alternative to SIP, H.323 Pronounced eeks
3 Where is IAX used? Between Asterisk Servers for inter-pbx communication Links to your ITSP IAXy - Digium s IAX enabled ATA Soft Phones, some hard phones
4 Who Implements IAX? Asterisk (of course) FreeSWITCH Yate SofaSwitch OPAL No commercial vendors (yet!)
5 Benefits of IAX Single Port (UDP 4569), makes for easy scalability! Advanced Media Transfers Real trunking! Encryption (AES128) Authentication (Plaintext, MD5, RSA)
6 Scalability Load Balance-able (iax-proxy, LVS, etc) Dynamically Sized Thread Pool Binary Encoded for efficiency
7 Comparison: SIP vs IAX Bandwidth Usage Codec SIP IAX (Trunked) 1st Call Additional Calls 1st Call Additional Calls G.711 (64kbps) 80kbps 80kbps 80kbps 64kbps G.726 (32kbps) 48kbps 48kbps 46kbps 32kbps G.729 (8kbps) 24kbps 24kbps 23kbps 8kbps G.722 (64kbps) 80kbps 80kbps 80kbps 64kbps GSM (13kbps) 29kbps 29kbps 28kbps 13kbps * Bandwidth includes IP overhead, and accounts for only one side of the call. Total usage is double the shown value since VoIP traffic usage is symmetric.
8 Comparison: SIP vs IAX Bandwidth Usage, Total Calls (G729) 240 SIP IAX (Trunked) kbps 256kbps 768kbps 1mbit 2mbit
9 Comparison: SIP vs IAX Bandwidth Usage, Total Calls Codec SIP IAX (Trunked) DSL T1 DSL T1 G.711 (64kbps) G.726 (32kbps) G.729 (8kbps) G.722 (64kbps) GSM (13kbps) * DSL bandwidth presuming 768kbps available, T1 presuming 1.5mbps
10 IAX Pro s Bandwidth: IAX Trunks, SIP does not. Network Configuration: IAX traverses NAT and firewalls with ease. SIP requires more effort (STUN, ICE, TURN) Internationalization: IAX sends language info in headers QoS: IAX gathers its own performance stats (latency, jitter measurements) Remote Dialplan: IAX can ask a peer about its dial plan, allowing dialplans to be centralized
11 SIP Pro s SIP has been around longer and has much greater adoption in the industry Greater numbers of hardware manufacturers (PBX, IP Phones) implement SIP than IAX in their equipment There is a much more broad audience looking at and using SIP. Because of this you will find many more SIP tools (diagnostic, monitoring, load testing, etc) than IAX tools.
12 Planning your IAX setup Codec Selection Audio Quality or Bandwidth Efficiency? CPU - Are we going to transcode? QoS LAN Switches that honor QoS (DiffServ), set ToS bits in Asterisk WAN Traffic shaping at your router, consider your endpoints.
13 Topology Example Voice Gateway (Asterisk)
14 Topology Example Voice Gateway (Asterisk) Internet PSTN (T1 PRI)
15 Topology Example Client (ADSL) Voice Gateway (Asterisk) Internet PSTN (T1 PRI)
16 Topology Example Client (ADSL) Voice Gateway (Asterisk) Internet PSTN (T1 PRI)
17 Topology Example Client (ADSL) Voice Gateway (Asterisk) Peering Internet PSTN (T1 PRI)
18 Topology Example Client (ADSL) Voice Gateway (Asterisk) Peering DSL Provider Internet PSTN (T1 PRI)
19 Topology Example Client (ADSL) Voice Gateway (Asterisk) Peering DSL Provider Internet PSTN (T1 PRI)
20 Topology Example Client (ADSL) Voice Gateway (Asterisk) Peering DSL Provider SIP Provider Internet PSTN (T1 PRI)
21 Topology Example Client (Far Away) Voice Gateway (Asterisk) Peering DSL Provider SIP Provider MPLS Internet PSTN (T1 PRI)
22 Config Example Client Server register => [servername] type=friend host=myitsp.com secret=mysecret notransfer=yes dtmfmode=rfc2833 context=inbound qualify=yes trunk=yes disallow=all allow=g729 [clientname] type=friend host=dynamic secret=mysecret notransfer=yes dtmfmode=rfc2833 context=outbound qualify=yes trunk=yes disallow=all allow=g729
23 IAX Capable ITSPs Voxter Communications - POPs in Vancouver, BC, Canada, Seattle WA, Phoenix AZ, full North American Termination/Origination VoicePulse TelIAX More listed at voip-info.org
24 Thanks for coming! Any questions?
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