Re: Bonded T1 vs. Comcast Business Class
There shouldn't be any issues, just make sure that you can port your numbers between the Telcos.
Also if you have non-geographic numbers, (in the UK this would be free phone numbers and premium rate numbers) make sure that you talk to your provider for those as well and make sure that you understand their procedure and lead times for changing over, (if you can't take your old numbers with you then you'll need to make sure that the non-geographic services are redirected to different numbers)...
by and large... no, changing phone numbers isn't a big deal.
just talk to all your providers first, make sure you understand the exit requirements for your existing supplier, (how much notice do you need to give)
and that you understand what the procedure for taking up service with the new company is. and their lead times. that way you should be able to plan for the old service to stop and the new service to pick up straight away.
Do you have a working from home strategy? the worst case scenario is that you'll be without phone and internet if everything goes wrong!
as for changing the internet lines, just make sure that nothing is tied to your existing service.
for example in the UK many BT Buisiness customers may receive free hosting, -tied to their contract, and free DNS services to point domain names to their address space, (where their address space is actually provided by the ISP.)
By this I mean, where I used to work we have four addresses lets say 22.214.171.124, 126.96.36.199 188.8.131.52 and 184.108.40.206, they were owned by BT, but provided to use so that we had out own tiny /31 subnet. When we left BT, those addresses are still owned by BT.
The place I work now has a large IP block, there is a /22 subnet (1022 addresses).
that's owned by the company I work for, so no matter who the IP is we keep the addresses.
you need to figure out if anything connects directly to your office, and is this by name, (in which case DNS will need to change) -hint reduce the TTL before the big day!
or do things connect by IP address. (in which case managing these things will be harder).
(things connecting to your office night be for...)
internally hosted mail servers, or web servers or FTP servers etc.
Best advice, just talk to suppliers and make a plan.
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