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Example SIP call flows:

Cisco.COM: SIP Call flows for the 7960 IP phone
Easy SIP Call Flow
http://www.ietf.org/rfc/rfc3665.txt: Session Initiation Protocol (SIP) Basic Call Flow Examples
http://www.iptel.org/info/players/ietf/callflows/

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Bridging from IAX=>SIP Number
by tinkerghost Fri 29 of Aug, 2008
I have a laptop that's frequently behind firewalls and SIP frequently won't work. I've set up Asterisk on my home server, and I can contact the server and place calls either to the internal network or route them out through my DID provider - it also works in reverse. However, what I cannot do is place a call directly to a SIP phone without having to have created a context for the company.
In other words, I want to dial 1234@example.com from KIAX and have the phone with a SIP number of 1234@example.com ring with no example.com context in the extensions.conf file
It seems like I should be able to do it, but the IAX call handles the @ as a context marker & rejects the calls.
Any help would be appriciated
Originate dials ok but no DIALSTATUS
by simonInOz Tue 26 of Aug, 2008
Using the Manager interface, I issue an Originate command. It indeed dials, and is handled in the dialpan, but the DIALSTATUS value is empty (I have tried answered and unanswered calls).
I am using Trixbox 2.6.18-53.1.4.el5 (SMP)
Any idea why this is so? (How can I determine how the call went?)

exten => s,1,NoOp(HANGUPCAUSE is ${HANGUPCAUSE})
...
Re: SIpura + VOIP solution
by admin Mon 25 of Aug, 2008
To get a DID number you need a VOIP service provider:
VOIP Service Providers
There are some free services, and a number of low-cost vendors.
SIpura + VOIP solution
by ratlewhisk Mon 25 of Aug, 2008
Hi ,

I have a SPA 3000 + ADSL connection + analogue phone
things i do require to set up a voip connection.
As as i researched
...
STARTING UP NEW CALLING CARD BUSINESS
by kotel Sun 24 of Aug, 2008
Hello everybody, any ideas which company offer the most reliable automated online Calling Card Platforms or VoIP plans for start ups ?
please advise ,