TELECOM Digest OnLine - Sorted: Two VOIP Boxes on the same port

Two VOIP Boxes on the same port

Fred Atkinson (
Fri, 19 Aug 2005 18:29:31 -0400

As I've previously mentioned, I've just moved from Columbia, SC to
Sylva, NC. I took my Vonage phone (Columbia number) with me and got a
new VOIP phone from Voicepulse (Sylva, NC number). I've got both of
them connected to my Cisco 831 router via Ethernet cables.

I've been having some problems getting fast busies when dialing. I
hang up and dial it a second time and it goes through. Voicepulse was
not able to sort it out so I contacted Sipura, who was the
manufacturer of the VOIP adapter (Sipura 3000).

Sipura said that having two VOIP devices on a single router can be a
problem. To fix it, they said that you have to change the SIP port on
one of them. Typically, I believe they said that it was on port 5061
and 5062. They suggested changing one of them to 5063 or above.

I called Voicepulse and asked them to make the change. They said that
wasn't possible. I spoke with the supervisor there. He said that
their system wouldn't accomodate me using a different SIP port from
the one I have now.

Can the VOIP experts on here sort this out? To expand upon my system,
I have a Cisco 831 home/office router connected to Mediacom
cablemodem. Each VOIP device is plugged directly into an Ethernet
port on the router.

Is Sipura's story plausible? How likely is it that Voicepulse is
telling the truth about not being able to change the SIP port to
communicate with their system?

Any feedback would be greatly appreciated.


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