Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Voip over ADSL

Hi

i see that cisco ship whit the 827-4v adsl voice router foe little customer. my question is : can the adsl net grant the necessary layer 2 performancem latency,fragmentation,caching,etc... to obtain a good voice quality? whitch QoS can help? same example?

thanx

Luigi

Italy

3 REPLIES
Silver

Re: Voip over ADSL

You can’t guarantee QoS SLA’s over the Internet but you can have your DSL connect you directly to the corporate network. Your SP should be able to provide SLA’s on that setup.

New Member

Re: Voip over ADSL

What are the upstream and the downstream bit rates you are working on?

New Member

Re: Voip over ADSL

I have a Cisco 7940 IP phone and use it with ADSL (512/128) The 7940 has a built in switch, so I plug the network PCs in the 100mb switch port and the 7940 in the ADSL router. The phone set all VoIP packets to have IP Precendece of Flash (very high) which takes priority over the other traffic. I'm in the UK, the Cisco Call Manager is in the US and it works very well even running G.729 compression/codec. Some deterioration is noticable if I call an off network PSTN number however, but IP phone to IP phone is great.

Regards

Richard

159
Views
0
Helpful
3
Replies