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CISCO QOS BETWEEN 1801 and 877

Hi there really looking for some help on this, only recently started using cisco kit and been really impressed so far however as my knowledge is limited currently I have become stuck.
I have a customer I need to set up QOS for voip between there two sites, they have a cisco 1801 at the ho and a cisco 877 at the other, they also have a 857 at another site they may want to link to later.
I know of the auto qos voip trust command on the 1801 but nothing exists on the 877 for this, how do I go about configuring on the 877 and also (if its possible on the 857)?
Thanks in advance,
Networking Hardware-OtherRoutersNetwork Management

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Thanks for the reply, what you have put has helped greatly in understanding how you impliment the QOS on the routers, looking at your comment you suggest a access list entry can be set up to show the destinations for both the to and from locations. This would probably be the best way of going about this from our customers perspective. I have never had any expieriance in setting up QOS and very little expieriance with VOIP and I am still waiting for more information from the phone company that have installed the phone system that requires the QOS between the two sites as to if the communication for VOIP goes between the two main phone systems and is then presented out to the users phones or if the calls go direct from one phone to anothwer via ip address. Once I have this I should be ablke to supply a definative answer on how to identify the QOS traffic. If possible though could you show me how I would do this using access lists as the identifying factor.
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I'll try to help any way I can.   If you can tell me more about the specifcs of the phone systems, the IP addressing, and overall architecture, this should be a pretty easy task.

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

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