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"could not find dialog id" exceptions in rtr

Pardon my lack of knowledge on this piece of ICM but that is why i am here.  I wish to better understand how a dialog is established between ICM-CVP as I believe that is the dialog id that the below exeception is referencing.

The environment I'm currently involved in is experiencing a lot of errors like this:

13:10:08:167 ra-rtr Trace: For message (9) from routing client CVP2_RC (ID 5023) could not find dialog id (376431).

13:10:08:339 ra-rtr Trace: For message (9) from routing client CUCM1_RC (ID 5000) could not find dialog id (-1).

13:10:08:542 ra-rtr Trace: For message (9) from routing client CUCM1_RC (ID 5000) could not find dialog id (-1).

13:10:08:604 ra-rtr Trace: For message (9) from routing client CUCM1_RC (ID 5000) could not find dialog id (-1).

13:10:08:917 ra-rtr Trace: For message (9) from routing client CUCM1_RC (ID 5000) could not find dialog id (-1).

13:10:09:198 ra-rtr Trace: For message (9) from routing client CUCM1_RC (ID 5000) could not find dialog id (-1).

13:10:09:292 ra-rtr Trace: For message (9) from routing client CVP2_RC (ID 5023) could not find dialog id (376441).

13:10:09:573 ra-rtr Trace: For message (9) from routing client CUCM4_RC (ID 5015) could not find dialog id (-1).

13:10:09:776 ra-rtr Trace: For message (9) from routing client CVP5_RC (ID 5020) could not find dialog id (1657301).

Is the router responsibile for establishing a dialog id w/CVP at the start of each call?  Why are all the the dialog id's from our CallManager Routing Clients NULL or (-1)? 

Is the dialog id dependent upon the correlation id?  I'm not seeing dialog failures due to correlation id issues.. just lots and lots of cases of routing clients unable to locate their dialog ids

Could someone provide some context on what/how dialogs are establish, used for, and maybe reasons why they could be lost from a router's perpesctive but somehow the routing client is remembering them?

This is a CVP comphrensive SIP call flow. ICM version 7.5.10  CVP 7.0(2)

Thanks!

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