Connecting Your Enterprise With Asterisk: IAX to Carriers - Asterisk-ES
Connecting Your Enterprise With Asterisk: IAX to Carriers - Asterisk-ES
Connecting Your Enterprise With Asterisk: IAX to Carriers - Asterisk-ES
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<strong>Connecting</strong> <strong>Your</strong> <strong>Enterprise</strong><br />
<strong>With</strong> <strong>Asterisk</strong>: <strong>IAX</strong> <strong>to</strong> <strong>Carriers</strong><br />
Day<strong>to</strong>n Turner<br />
Voxter Communications
What is <strong>IAX</strong><br />
Inter <strong>Asterisk</strong> eXchange<br />
Developed by Digium<br />
and the Open Source<br />
Community<br />
Alternative <strong>to</strong> SIP,<br />
H.323<br />
Pronounced “eeks”
Where is <strong>IAX</strong> used<br />
Between <strong>Asterisk</strong><br />
Servers for inter-PBX<br />
communication<br />
Links <strong>to</strong> your ITSP<br />
<strong>IAX</strong>y - Digium’s <strong>IAX</strong><br />
enabled ATA<br />
Soft Phones, some<br />
hard phones
Who Implements <strong>IAX</strong><br />
<strong>Asterisk</strong> (of course)<br />
FreeSWITCH<br />
Yate<br />
SofaSwitch<br />
OPAL<br />
No commercial vendors (yet!)
Benefits of <strong>IAX</strong><br />
Single Port (UDP 4569), makes for easy scalability!<br />
Advanced Media Transfers<br />
“Real” trunking!<br />
Encryption (A<strong>ES</strong>128)<br />
Authentication (Plaintext, MD5, RSA)
Scalability<br />
Load Balance-able<br />
(iax-proxy, LVS, etc)<br />
Dynamically Sized<br />
Thread Pool<br />
Binary Encoded for<br />
efficiency
Comparison: SIP vs <strong>IAX</strong><br />
Bandwidth Usage<br />
Codec<br />
SIP<br />
<strong>IAX</strong> (Trunked)<br />
1st Call Additional Calls 1st Call Additional Calls<br />
G.711 (64kbps) 80kbps 80kbps 80kbps 64kbps<br />
G.726 (32kbps) 48kbps 48kbps 46kbps 32kbps<br />
G.729 (8kbps) 24kbps 24kbps 23kbps 8kbps<br />
G.722 (64kbps) 80kbps 80kbps 80kbps 64kbps<br />
GSM (13kbps) 29kbps 29kbps 28kbps 13kbps<br />
* Bandwidth includes IP overhead, and accounts for only one side of the call. Total usage is double the shown<br />
value since VoIP traffic usage is symmetric.
Comparison: SIP vs <strong>IAX</strong><br />
Bandwidth Usage, Total Calls (G729)<br />
240<br />
SIP<br />
<strong>IAX</strong> (Trunked)<br />
240<br />
180<br />
120<br />
93<br />
120<br />
84<br />
60<br />
30<br />
13<br />
5 10<br />
42<br />
32<br />
0<br />
128kbps 256kbps 768kbps 1mbit 2mbit
Comparison: SIP vs <strong>IAX</strong><br />
Bandwidth Usage, Total Calls<br />
Codec<br />
SIP<br />
<strong>IAX</strong> (Trunked)<br />
DSL T1 DSL T1<br />
G.711 (64kbps) 9 19 11 23<br />
G.726 (32kbps) 16 32 23 47<br />
G.729 (8kbps) 32 64 93 190<br />
G.722 (64kbps) 9 19 11 23<br />
GSM (13kbps)<br />
26 52 57 117<br />
* DSL bandwidth presuming 768kbps available, T1 presuming 1.5mbps
<strong>IAX</strong> Pro’s<br />
Bandwidth: <strong>IAX</strong> Trunks, SIP does not.<br />
Network Configuration: <strong>IAX</strong> traverses NAT and firewalls<br />
with ease. SIP requires more effort (STUN, ICE, TURN)<br />
Internationalization: <strong>IAX</strong> sends language info in headers<br />
QoS: <strong>IAX</strong> gathers its own performance stats (latency,<br />
jitter measurements)<br />
Remote Dialplan: <strong>IAX</strong> can ask a peer about its dial plan,<br />
allowing dialplans <strong>to</strong> be centralized
SIP Pro’s<br />
SIP has been around longer and has much greater<br />
adoption in the industry<br />
Greater numbers of hardware manufacturers (PBX, IP<br />
Phones) implement SIP than <strong>IAX</strong> in their equipment<br />
There is a much more broad audience looking at and<br />
using SIP. Because of this you will find many more SIP<br />
<strong>to</strong>ols (diagnostic, moni<strong>to</strong>ring, load testing, etc) than <strong>IAX</strong><br />
<strong>to</strong>ols.
Planning your <strong>IAX</strong> setup<br />
Codec Selection<br />
Audio Quality or Bandwidth Efficiency<br />
CPU - Are we going <strong>to</strong> transcode<br />
QoS<br />
LAN<br />
Switches that honor QoS (DiffServ), set ToS bits in <strong>Asterisk</strong><br />
WAN<br />
Traffic shaping at your router, consider your endpoints.
Topology Example<br />
Voice<br />
Gateway<br />
(<strong>Asterisk</strong>)
Topology Example<br />
Voice<br />
Gateway<br />
(<strong>Asterisk</strong>)<br />
Internet<br />
PSTN<br />
(T1 PRI)
Topology Example<br />
Client<br />
(ADSL)<br />
Voice<br />
Gateway<br />
(<strong>Asterisk</strong>)<br />
Internet<br />
PSTN<br />
(T1 PRI)
Topology Example<br />
Client<br />
(ADSL)<br />
Voice<br />
Gateway<br />
(<strong>Asterisk</strong>)<br />
Internet<br />
PSTN<br />
(T1 PRI)
Topology Example<br />
Client<br />
(ADSL)<br />
Voice<br />
Gateway<br />
(<strong>Asterisk</strong>)<br />
Peering<br />
Internet<br />
PSTN<br />
(T1 PRI)
Topology Example<br />
Client<br />
(ADSL)<br />
Voice<br />
Gateway<br />
(<strong>Asterisk</strong>)<br />
Peering<br />
DSL<br />
Provider<br />
Internet<br />
PSTN<br />
(T1 PRI)
Topology Example<br />
Client<br />
(ADSL)<br />
Voice<br />
Gateway<br />
(<strong>Asterisk</strong>)<br />
Peering<br />
DSL<br />
Provider<br />
Internet<br />
PSTN<br />
(T1 PRI)
Topology Example<br />
Client<br />
(ADSL)<br />
Voice<br />
Gateway<br />
(<strong>Asterisk</strong>)<br />
Peering<br />
DSL<br />
Provider<br />
SIP<br />
Provider<br />
Internet<br />
PSTN<br />
(T1 PRI)
Topology Example<br />
Client<br />
(Far Away)<br />
Voice<br />
Gateway<br />
(<strong>Asterisk</strong>)<br />
Peering<br />
DSL<br />
Provider<br />
SIP<br />
Provider<br />
MPLS<br />
Internet<br />
PSTN<br />
(T1 PRI)
Config Example<br />
Client<br />
Server<br />
register => clientname:mysecret@myitsp.com<br />
[servername]<br />
type=friend<br />
host=myitsp.com<br />
secret=mysecret<br />
notransfer=yes<br />
dtmfmode=rfc2833<br />
context=inbound<br />
qualify=yes<br />
trunk=yes<br />
disallow=all<br />
allow=g729<br />
[clientname]<br />
type=friend<br />
host=dynamic<br />
secret=mysecret<br />
notransfer=yes<br />
dtmfmode=rfc2833<br />
context=outbound<br />
qualify=yes<br />
trunk=yes<br />
disallow=all<br />
allow=g729
<strong>IAX</strong> Capable ITSPs<br />
Voxter Communications - POPs in Vancouver, BC,<br />
Canada, Seattle WA, Phoenix AZ, full North American<br />
Termination/Origination<br />
VoicePulse<br />
Tel<strong>IAX</strong><br />
More listed at voip-info.org
Thanks for coming!<br />
Any questions
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