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Voice vs Data

Hi Experts,

Due to a lot of restrictions, we can't share  our data network with voice, and we only have analog phones now.  Another limitation we have now is we only have a single Ethernet drop for each office.  A phone company mentioned that they will bring in their own T-1, so they don't have to use our existing T-1 (for data only) and can still use the only existing Ethernet drop to route traffic out to different T-1 lines, by plugging in the computers to the back of the phone.  My question is... is it even possible to separate the traffic so they go through different T-1 lines by using the same Ethernet drop?  How can I be sure that the voice and data networks do not bleed into each other?  Please advise.  Thanks much!
2 Solutions
Paul MacDonaldDirector, Information SystemsCommented:
Yes, it's possible.  You would segregate traffic by putting each device (computer/phone) on its own VLAN, then route it to the appropriate default gateway at the switch.  

Frankly, this is the sort of thing your provider should sit down and explain to you.
Bryant SchaperCommented:
Are you migrating to SIP/VoIP, and who is that vendor as well?

Paul is correct, use separate vlans, i'll explain with Cisco, but process is similar with Shoretel or Mitel.  So we use Call Manager, the phone and computer share the same ethernet port, the phone picks up the voice vlan, vlan 2 in our case, and the second port on the phone is assigned as an access port on vlan 1 for data.

Now we run to a central data center for our offices, but in your case you may have your phones talking straight to the router, and the additional from the phone company may just be a DS-1, which is digitial phone service that gives you 23 phone lines but no data.  Then your router simply routes the calls out that T1.

It is a bit complex to explain, but what you asking for is certainly possible.  I would not recommend running voice and data over a single t1 unless your office is small.  Phone companies may offer that as well, I know we use to use a product that was similar, the carrier installed a router that either provided us a T1 handoff for voice to our PBX and an ethernet connection, or they broke the ports to analog so we could bring them into our PBX and still gave us an ethernet.
swgitIT ProfessionalAuthor Commented:
Thank you, Gentlemen!  Your inputs are very helpful.
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