I was snooping around on some other forums and stumbled on something I'd like to bounce off the group.
Here's the scenario:
1 Mitel SIP Proxy (MBG)
1 3300
2 ATT SBS. - (2) unique IP addresses ATT load balances for calls to the customer site.
Since ATT does not use authentication, the way to identify the SIP trunk in the Mitel is with the DID they are sending.
We can set up two network elements for the ATT SBCs but because ATT will always send up the same DID numbers we can only use the numbers to identify one trunk.
What that means is we can only have one SIP peer with ATT. Since ATT is load balancing to us between two, every other call will fail.
So I stumbled on a post where someone else identified the problem and was asking if there was a way around this problem and connect to both of ATTs SBCs.
Someone came back with an answer that I don't fully understand so I'd like to bounce it off you to see if the answer is good or just plain wrong.
Here's the suggested solutions in its entirety:
Set your MBG to use DNS records and then set up 2 A records for your sip dns name with the 2 proxies.
i.e. set up sip.mitel.com as the DNS name.
Create 2 x A records in the DNS entry 85.199.244.244 & 85.199.234.234 (examples).
Is this something that would work? I don't understand how but that could easily be that i don't understand DNS A records.
Ralph