extension lines to remote office

wexfordman

Hi,

How would I go about extending extension lines from a pbx to a remote office ? The idea being that the extension lines in the remote location would be voip, but would behave as if an extension of the pbx system in the main office. Hope this makes sense, and someone could point me in the right direction. My basic understanding is I could locate a few ATA'a at the remote office, and other ATA's in the main office, which ould be wired to the PBX extensions. Each ATA would be registered/paired to its recipricol ATA at each end if that makes sense. I think I would need two seperate ata types, one with fxo, the other with FXS. Apologies if this makes little sense.

Regards,
Wexfordman

MickyJoe

The type of equipment you probably want to look for are VoiP Gateways instead of basic ATAs.

lightdude

it depends on the PBX you have. If it is IP enabled then you just need a Voip phone and broadband connection in your remote office and connect this to your PBX. You will need to port forward 5060 on your router to you PBX for SIP and the port range 10000-10100 for RTP traffic.

wexfordman

Lightdude,

Never got round to looking at this, but looking at it again now. The pbx is analog only, so analogue extensions to be extended to remote building. I was thinking about a gxw4004 and gxw4104 combination, but I think its not quite as straightforward as that. I am not sure if I can tie each port on each device directly to each other if you know what I mean. Any advice would be appreciated.

Thanks,
Wexfordman

JohnnieM

Whats the make and model of the pbx?.. How many lines is it capable of handling?how many lines are you using?

You could always simply use a netgear 2 port Voip router (reccomend Blueface) and feed it in to your analogue co's and programme a one touch button to dial the blueface extension of the remote Ata

wexfordman

Not sure what you mean with regards blueface, I was not going to use any ITSP, as its all effectively on the internal lan (remote building is connected to the lan). Not sure what the pbx type is, have to check it out, but was told by by the provider that he could provide 4 analogue extensions in the main building, so all we have to do is go Analoge-IP-Analoge-Handsets

4 extensions in total. I was in touch with grandstream, and they said the gxw's would do:-

"The described by you scenario will work. Please refer to the following document which describes detailed steps for configuration such functionality using peer to peer application of our GWs. The desired by you mode called port to port mapping.

Here is the link:
http://grandstream.com/user_manuals/Extending_Analog_Lines_Using_GXW_Series.pdf"

Wexfordman

JohnnieM

Look up www.blueface.ie very good voip provider... you can avail of their pay as you go service for free all you need do is purchase equipment..(bout €90 plus vat). if you can hook up and analogue telephone adaptor to a couple of spare lines o the pbx your desk phone can dial the remote extension.. Not familiar with the Grandstream equipment ..the granstream option only seems to allow you acces the lines remotly...looks interesting must read it in more detail..let es know what type of pbx, how many lines etc etc

lightdude

Looks like a simple solution Wexfordman. Good find.

If you do need a SIP Proxy then there are number of completely free ones out there, freeworlddialup, it's only the SIP traffic that will be carried over the internet, your actual voice stream (RTP traffic) will be over your lan so call quality should be grand.

wexfordman

Hi Jonne,

I think I know what you mean now. I use BF myself, but this solution will be entirely on the internal LAN, basically tying a gatweay and an ATA together.

Lightdude, thanks for that, it does seem fairly straightforward, I was mainly worried that I could not tie the ports on each device together (i.e port 1 on the 4004 only talks to port 1 on the 4104), if you know what I mean, but grandstream say you can. You know sometimes how these things look like they should work, and then you find some strange reason why they cant possible.

Going to order them today,and play around with them during the week, will let you know how I get on.

Regards,
Wexfordman