This probably doesn't answer your question directly but is perhaps food for thought if you didn't know or think of this already:
firstly out of order or sequence is to be expected as UDP is inherently unreliable. The reason why you may not experience audio issues even if you see out of order packets is due to the jitter buffers to correct these issues, up to a point obviously.
as a test, you could try multiple captures at multiple points for the same call and compare. perhaps run a trace on the mbg and on the phone for the same call.
Also look at the direction of the packets, for instance on the internal leg of MBG, packets travelling toward the internal side should be in order since the jitter buffer would have sorted them out as they came in on the dirty interface. packets travelling northbound could be out of order/sequence since they were not yet subjected to the jitter buffer. audio issue may be one way or two way since there are two distinctly different stream. the fact that they belong to the same call does not mean the network treats both streams equally.
