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What you are describing is similar to the Acme TSM product where sip
/ rtp are wrapped in a tunnel for nat traversal purposes. <br>
<br>
It actually has quite a few strengths but all of them depend on the
tunneling devices ability to detect failure and re-negotiate. If
there are any interfering devices in the middle with ALG's etc it
should cut right through them, and as far as overhead goes, as long
as you arent doing any crypto its actually pretty light. <br>
<br>
You will want to be aware of path MTU for signaling traffic since
the extra bits of overhead can pad a large sip packet (think invite
with custom headers and large-ish SDP) over 1500 bytes which will
cause fragmentation issues. Consider going to compact headers to
eliminate this and make some overhead room. RTP wont have this issue
of course. <br>
<br>
Will you be doing sip over udp or tcp for this? <br>
<br>
Who will be managing the GRE tunnel endpoints, and what devices will
be doing the tunneling? <br>
<br>
What is your sip redundancy model right now? <br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 08/13/2013 07:17 AM, Bob Hancock
wrote:<br>
</div>
<blockquote
cite="mid:CAMZUC4hSyoG6FrUnBfQz-MVN7oKHsi_a-OPUdyhJ+H6N=T_6Tw@mail.gmail.com"
type="cite">
<div dir="ltr">I have a project in which a user is interesting in
interconnecting and deploying ATAs for VoIP services but wants
to use private IP addressing on the devices. My initial though
is to NAT these devices and allow my SBC to handle NAT traversal
for them. This allows the to use their dedicated connection to
my network or if that link goes down fail over to moving to
connecting across the internet. They are interested in
potentially doing a GRE tunnel and keeping the private
addressing in place as it traverses that tunnel. I am concerned
about encapsulating the VoIP traffic as well as with the fail
over options. Does anybody have any experiences with VoIP over
GRE tunnels and what type of results and challenges you
encountered? Thanks.
<div>
<br>
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<div>--BH<br>
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<br>
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