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Considering pbxnsip, with Questions

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We are a small business (about 40 people) in Los Angeles with several small offices (about 2-5 users each) around the world and are looking to switch from a Hosted IP Solution to an in-house SIP solution and are seriously considering pbxnsip. We currently have Exchange 2007 and OCS 2007 and are looking to unify our communications/messaging with whatever IPPBX solution we choose. We want to keep all of our existing handsets, mostly Polycom IP 501, 601 and 430s.


Also, we are talking to XO Communications to provide us with a 10Mb Dedicated Ethernet connection (we deal with very large files on a daily basis) with SIP Trunking. They have told us that pbxnsip is not officially supported on their list of IPPBXs, although I’m sure it could work seeing as though they are providing us a basic SIP Trunk.


Are there any IP Telephony specialists in the LA area who integrate pbxnsip. I’m sure our IT team could do it themselves, but I’d like piece of mind that everything is going to work day 1. If not, what kind of support does pbxnsip offer to help us integrate everything together?


We have a few questions, such as:


1. What add’l equipment will we need? Do we need a gateway (such as the AudioCodes Mediant 1000) with XO Communications SIP Trunking or does it terminate directly into pbxnsip?

2. Is there any add’l equipment needed to integrate MS Unified Communications? We already have an Exchange 20007 and OCS 2007 Server. I’m assuming we’ll need to setup a Mediation Server.

3. Is there a visual network topology diagram we can refence to see how the equipment is situated?


Any help would be greatly appreciated. We're looking to make this decision in the next 30 days.



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Guest kevin

Hi Tim, I will send your post to a couple of VARs in the LA area.

1) if you are using pure SIP trunks you shouldn't need any PSTN equipment unless you want to have a backup and then an M1K would do the job. pbxnsip support SIP trunks directly. 2) You mean UM 2007 server for exchange? You want need anything else since we can SIP trunk to it. I thought we can talk to OCS 2007 server with a trunk. Check out wiki.pbxnsip.com and search on OCS and then exchange and there are pages on there for those topics. 3) I think the OCS wiki page has some nice pictures. If not we can send you something. If you have any contacts at XO we can work with to get on the certification list we will contact them. Thanks, Kevin

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I need a good reason to go to LA..


We have a similar client with 50+ internal handsets all talking to a single low end server (AMD3100) XPPRO-stripped down on running services.


Three NICS

One to a dedicated PRI gateway for 23 call paths to the Local Carrier

One with a Public IP and DNS-SRV records assigning UDP-SIP

Another on the internal LAN that all Phones (Snom) register against via DHCP PNP


Remote offices in 3 states with local cheap Dial tone from Cable carrier or local lec with 2 to 3 POTS lines going into the PBXnSIP CS410 appliance.


Local calls come in FXO/POTS

Comcast offer POTS lines and Internet allowing unlimted LD on pots and negates the need for trunks to save costs... (speed dial the HQ and others)

$35 for a pots from Comcast.


We put the Intetex VoIP firewalls in all remote sites.


Local extensions dial 55501 for main office and we SIP trunk to HQ.... or 55502 for other office or 55503 for another and so on.


In HQ 1/3 of phones also have PC on switch port...


The 50 phones used to be separated by 54MB wireless WDS Bridge and that ran for a very long period (6 plus months) before new offices were complete.


I've posted many technical notes on a wide variety of our config and performance. All all have been successful and we continue to do more.


The devil is in the detail toos.


POE,QOS.PNP,DIALPLANS, AUTOATTENDANTS, and SNMP monitoring is a must...to create baselines to isolate that future burp and they do happen and without good baselines, everybody blames the PBX. (Gauranteed, just read a bunch of posts)

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  • 2 months later...
3. Is there a visual network topology diagram we can refence to see how the equipment is situated?


Hi Tim, maybe the picture at the end of the wiki article "Basic Setup for pbxnsip / Office Communications Server 2007 Interoperability OCS" is like what you are looking for?


Best regards,


Jan Boguslawski

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