Re: Help needed on VoIP project

[Steve Blair <>]

Hello:

 In our experience users who moved to an IP phone first wanted to know
that their set of  "user level features" would still be available. Once we
could provide the same "user level features" they then asked about
advanced features (like integrated voice and email) and finally they
were concerned about call quality.

 Over time call quality has become a major concern. We are currently
operating in a low latency environment with distributed PSTN
gateways. Still we sometimes have echo, and dropped audio problems.
The IP phones user now care more about call quality then features.

  So if we are comparing vendors I think a user level feature-by-feature
comparison is helpful but I would like to see IP specific features added to
the list. Some features to consider are:

- The ability to set 802.1p COS and DiffServ code points at the
    (hard or soft phone interface)

- The ability to see rudimentary network health info at the phone
   interface (REGISTER status, jitter, packet loss)

- Phone management options (tftp, web, telnet, external host based utility)

-Steve

john p. streck wrote:

> Guy and Jon,
> This is true but one must have a working end to end system (some 
> through put) at least some
> of the time before this comes to the head of the list.
>
> progression: not working>working sometime>working good but not ideal> 
> working just like ma bell
> (just a joke)
>
> later,
> john
>
>
>
> On Mar 1, 2004, at 9:15 AM, Guy T Almes wrote:
>
>     Jon,
>     I agree.
>     Robustness of user experience in the presence of
>     good-but-perhaps-not-very-good IP service is one way to put it.
>     Regards,
>     -- Guy
>
>     --On Monday, March 01, 2004 07:54:31 -0500 Jon Zeeff
>     
> <>
>  wrote:
>
>
>         This is somewhat off topic, but to me, the most important
>         thing to test
>         is resistance to packet loss and jitter.
>
>             VoIP project. One of the 2004 projects is to evaluate SIP
>             interoperability between various vendors SIP based
>             instruments and other
>             vendors SIP based servers. The goal is to document the
>             level of
>             interoperability. Listed below is a partial list of
>             desired voice
>
>
>
>
>
>
> *John P. Streck PE
> *Director-Networking R&D, NC State University
> Director NC-ITEC*
> *
> *work: *919.515.0106
> *mobile *919.601.1647
> *work fax: *919.513.1893
> *Email: 
> *
>
> *Mailing Address:
> *2620 Hillsborough Street
> Raleigh North Carolina
> 27695-7109
> United States of America

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