A site I support uses 3 T1s setup with multilink PPP. They are trying to use Jive which is a hosted VoIP provider, with horrible results. I want to know how packets are distributed between the individual T1s since I think this may help explain what is going on.
SNMP monitoring of the multilink interface shows that they have available capacity, but their VoIP test calls are horrible. It acts as if there is a huge amount of jitter and dropped packets. Though simple tests with PING/Iperf to not show jitter/latency that is as bad as you might expect given the call quality.
How are packets distributed between the multiple T1s. I assume that it isn't the same as Ethernet bonding.
If the multi-link PPP is an issue what can I look at on the routers that will show this? Can it be corrected? The routers are Cisco, I believe they are 2800s, but I would have to double check.