We are experiencing intermittent issues (individual site perspective) that are consistently (from a WAN perspective) occuring on our network where an analog device will cease functioning. We have four different and distinctly different devices that are experiencing this problem. These devices work fine if connected directly to a pots line. Also, we've found that they will work through a VG224. We just can't make them work on a router.
We have done extensive troubleshooting internally, as well as with TAC and there is no solution as of yet. I choose to be vague about what we've done, so as not to lead anyone in any direction as to the cause, hopefully resulting something new getting thrown out there. Short of knowing that the VG224 is sending the calls to the UCM using SCCP vs. the router using MGCP back to UCM (which should work too), what else might you think could be the issue? We have tried H.323 on these ports in a hybrid environment and we still experience intermittent issues.