01-22-2008 09:02 PM - edited 03-15-2019 08:22 AM
Topology - 7941 phone configured to use SIP - connected to a Linksys Switch which is connected to a IAD 2400 Series Router. All Phones register to a DNS Name called VOIP.XXXXXX.NET - This DNS correlates to our 2 Session Border Controllers. Call them SBC 1 and SBC 2.
When SBC 1 is online the phone functions without any issues. Place calls, receive calls, everything works flawlessly.
When we take SBC 1 offline to test redundancy and failover. The 7941 loses its registration and when I do a capture I only see the registration go out to VOIP.XXXXXXXX.NET but it is querying the IP address of SBC1 for the registration it never queries SBC2's IP Address for the registration. I have added the IP Address of SBC 2 in the Backup Proxy, Emergency Proxy everywhere in the config but when I take SBC1 online it never queries the IP of SBC2. I am at a dead end. PLEASE HELP I'M LOSING MY MIND TRYING TO FIGURE OUT THIS ISSUE.
01-23-2008 03:19 AM
Hi,
if you want your redundancy be based on DNS, you need to use a DNS server that changes address given in reply, based on the condition of fault. I would not be able to suggest a product or config that does that.
The phone is not supposed to try to registerto anything else after it got a valid reply from the DNS query.
01-23-2008 06:03 AM
But if a phone is registered with the PRIMARY SBC; and the PRIMARY goes down and you send an INVITE and it doesn't reply back from the PRIMARY shouldn't the phone send that INVITE to the SECONDARY SBC automatically.
01-23-2008 04:37 PM
From what I understand, the phone can try to use the servers according to the
It will not rely on the fact that there are multiple address in an DNS reply for a query to discover a server's address.
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