Need help with VoIP / WAN design

[TRSinNC]

Hello,

I am designing a WAN for our company. We have a total of 3 sites – the main office and 2 remote offices. I will connect the sites using either a MPLS VPN or Private Line T1 to each remote site. We have a BCM 400 in our main office. The other 2 sites will have a BCM 50. I plan on using the VoIP gateway to communicate between the offices. My question is which method should I use to connect my sites, MPLS or Private Line? Would either one give me better quality? Our data applications only use about 128k and I would like to do video conference once a week. If I go with private line, should I share the bandwidth or should I break the T into channels?

Thanks,

Tom

 

[frenche]

VoIP quaility depends on jitter, delay and packet loss. Good quaility voice needs <100 ms delay, ,<20 ms jitter and < 1% packet loss. If your WAN can deliver these parameters and you use QoS to prioritize voice, you can achive quaility voice. The type of WAN service does not matter if they can deliver these parameters but it is usally easier to get privite line sevice to meet the requirments. If you use QoS to prioritize voice, you can run voice and data on the same WAN connection.


French

 

[mforrence]

The advantage of private line T1 is that you control the entire pipe - which can be a huge advantage.
Mike

 

[TRSinNC]

Thanks for your input. I am going with the private line. Now I need to know which routers to use at each site. I know this may need to go in a differnet forum but I am going to ask anyway.

Phone company is trying sell me 3 Cisco 2811. Is this overkill for a simple wan connection? I will be using the VoIP gateway on the BCM to make calls between the sites and to route the remote site LD calls to the host. Would a smaller router do the job?