[Asterisk-Users] Voice over Frame Relay & Asterisk

[asterisk phones]

Great, thanks, that was the information I was looking
for.


--- Rich Adamson <radamson at routers.com> wrote:

> > Has anyone done Voice Over Frame Relay with
> Asterisk. 
> > With Frame Relay work reliably with Asterisk?  Any
> > experiences?
> 
> If you're talking about transporting voip calls
> across a path that
> includes frame relay links, yes it works just fine
> "if" you frame
> network is not congested.
> 
> Frame relay networks can and _may_ drop packets if
> the traffic exceeds
> the committed information rate (cir), depending upon
> exactly how your
> provider has their frame switches configured.
> Dropped packets is less
> of an issue now in frame networks then what they use
> to be, and the
> primary reason for that is the abundance of
> inexpensive bandwidth
> currently deployed between frame switches.
> 
> There is a pecking order in terms of which packets
> are candidates
> for being dropped, with broadcast traffic being high
> on that list.
> It is very difficult to determine exactly where
> packets are dropped
> as you (the user) are never notified by the frame
> provider when/if
> they dropped any in their switches. And, if they do
> drop packets
> you won't be able to detemine whether those that
> were dropped were
> in fact broadcast packets or tcp/udp packets, etc.
> The BECN and 
> FECN counts can be used to determine if the frame
> provider is 
> recognizing whether you exceeded your cir rate,
> however in most 
> real world implementations a BECN or FECN does _not_
> translate 
> into a dropped packet (at least in the US).
> 
> You might want to download Qcheck (it was originally
> written by NetIQ
> but spun off to another company now) to evaluate the
> end-to-end
> bandwidth. Its a free utility that will help
> determine what is
> actually available in terms of bandwidth.
> 
> If your frame network is congested, you might be
> able to implement
> QoS at the border routers to give some preference to
> voip packets.
> 
> Rich
> 
> 
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