Case Studies For Cisco CME Implementations Using SIP

Curiosityx

Curiosityx

Curiosityx

Soldato
Joined
17 Oct 2002
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Location
West Midlands
Greetings, our primary customer base is located in the UK, we have been deploying a number of voice products from Cisco from CME through to Call Manager, until recently we have relied on technologies such as dedicated leased lines and isdn for voip connectivity.

We have been using SIP for quite awhile but never looked at deploying it using DSL technologies such as ADSL and SDSL mainly due to the fact that most ISP's dont support QoS in an upstream or downstream direction.

Could i ask if anyone here has had success deploying SIP with CME over the above DSL technologies and what challenges if any you have faced as we find it increasingly difficult to get smaller customers to adopt more expensive connectivity options.

Regards
 
If you deployed an ADSL connection purely for SIP, I guess you wouldn't have to worry about local traffic at least. Although, I'm sure you are aware you could shape it locally, too. Are you worried about Internet congestion?

My Sip experience doesn't extend as far as Cisco based solutions but with Asterisk, you can choose from a variety of protocols to minimise your SIP traffic; g.729 offers good quality for very little bandwidth cost.
 
Speaking on behalf on an ISP....

QOS is basically impossible to implement over standard IPstream products, however our experience from testing and a couple of deployments of several hundred home workers is that it's good enough for, well, home workers to make a call and continue to work on terminal services/citrix over the same connection (providing a decent router with QOS is used).

Datastream products are more reliable and we have successfully trialed remote offices running voice over SDSL Datastream.

Basically our policy is homeworkers only on ipstream but small offices are supportable over datastream.
 
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