On Thu, 2006-04-27 at 15:04 -0400, Steve Melo wrote: > Greetings list and fellow Torontonians! > > I'm new to the world of asterisk and i have been asked by my employer to > look into voip solutions which would allow us to make voice calls over > the internet to our partner company in Calgary. In the meantime i got > my hands on a digum TDM400P w/ 2xFXO and 2xFSO ports which I've setup > and its all working beautifully. I have been able to setup sip phones > and have successfully made calls between the zap and local sip > interfaces. As I'm working along things are becoming more clear and I'm > getting excited about all the possibilities that asterisk has to offer, > the only foggy area remaining is how i can get free ld to Calgary? Our > Calgary office has a NEC NEAX 2000 IPS system which i have been told > uses ip phones, and so i believe their system is ip enabled. My > questions is, how to a setup a connection between the two offices?
The most practical way is to setup a VoIP trunk between the two
locations. Your tasks will be to:
1. Determine what to use for VoIP on the remote end. An asterisk box
will do just fine, you just need to connect it to the remote PBX. With
analog PBXs one would use an FXS card and connect using POTS lines. If
the remote PBX supports VoIP then it should be able to connect directly
to the Asterisk server here in Ontario.
2. Determine how to encrypt traffic. I don't want my calls to be clear
text on the Internet so I want to encrypt. I use a VPN tunnel, but
others use an encrypted form of SIP which I don't think is ready yet on
Asterisk.
3. Firewalls and routers need to be configured to allow the traffic.
They also need to be configured with traffic shaping to give preference
to VoIP packets.
4. Alter your dialplans on each end to send calls destined for
one-another through the VoIP trunks. There are many ways to do this and
it would be up to you to decide how you want it to work. I would
probably setup a leading digit like 8 to indicate that your dialling a
remote office extension.
5. Extend this by altering dial-plans further. Why not route calls
through the trunk destined for third parties and avoid more toll
charges?
Finally one cautionary note: VoIP over a non-managed Internet link can
often be inconsistent. You can get good sound quality during one part of
the day and poor sound quality during another. This can partially be
solved by configuring your router to give preference to VoIP traffic,
but you cannot control the routers on the Internet.
--
John Van Ostrand
Net Direct Inc.
Chief Technology Officer
564 Weber St. N. Unit 12
Waterloo, ON N2L 5C6
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[EMAIL PROTECTED]
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Linux Solutions / IBM
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