Two VOIP Boxes on the same port

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.

Fred

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Fred Atkinson
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