Telco nightly "REX" tests hang BRI ports on 3700

Several nights out of the week telco does a "REX" [?] test. When they do this, it hangs the BRI channels and they go in to a Deactivated state. I have to reboot the router to get them out of that state, bouncing the BRI interface doesn't fix it. Telco said that it was a bug in the router. Of course, they couldn't elaborate on that. Neverthelesss, I still need to know if there is something in the code or something with telco that I can check. I'm at the typical telco stalemate. There are 27 sites with the same hardware and software configuration and only this one site has the problem. Any ideas? Below is the hardware/software and some debugs that were captured. For now, I had telco turn the auto tests off so I don't have to reboot the router twice a week but I need to go back and re-visit this issue.
Voice NM-HD-2V
VIC2-2BRI-NT/TE
c3745-ipvoice-mz.123-11.T8.bin
isdn switch-type basic-5ess
Jan 29 02:20:49 172.200.95.1 283077: Jan 29 02:09:04.269: ISDN BR2/2 Q921: User TX -> RRp sapi=0 tei=89 nr=53
Jan 29 02:21:15 172.200.95.1 283091: Jan 29 02:09:34.330: ISDN BR2/2 Q921: User TX -> RRp sapi=0 tei=89 nr=53
Jan 29 02:21:15 172.200.95.1 283091: Jan 29 02:09:34.330: ISDN BR2/2 Q921: User TX -> RRp sapi=0 tei=89 nr=53
Jan 29 02:21:23 172.200.95.1 283092: Jan 29 02:09:34.342: ISDN BR2/2 Q921: User RX <- RRf sapi=0 tei=89 nr=74
Jan 29 02:21:23 172.200.95.1 283092: Jan 29 02:09:34.342: ISDN BR2/2 Q921: User RX <- RRf sapi=0 tei=89 nr=74
Jan 29 02:21:40 172.200.95.1 283099: Jan 29 02:09:46.039: ISDN BR2/2 Q921: User RX <- UI sapi=0 tei=127
Jan 29 02:21:40 172.200.95.1 283099: Jan 29 02:09:46.039: ISDN BR2/2 Q921: User RX <- UI sapi=0 tei=127
Jan 29 02:27:17 172.200.95.1 283205: Jan 29 02:14:47.105: ISDN BR2/2 Q921: User RX <- UI sapi=0 tei=127
Jan 29 02:36:05 172.200.95.1 283230: Jan 29 02:34:40.064: ISDN BR2/2 Q921: User RX <- UI sapi=0 tei=127
Jan 29 02:36:13 172.200.95.1 283231: Jan 29 02:34:40.064: ISDN BR2/2 Q931: MANAGEMENT_INFO pd = 8 callref = 0x00
Jan 29 02:36:47 172.200.95.1 283235: Jan 29 02:34:41.170: ISDN BR2/2 Q921: User RX <- UI sapi=0 tei=127
Jan 29 02:36:55 172.200.95.1 283236: Jan 29 02:34:41.170: ISDN BR2/2 Q931: MANAGEMENT_INFO pd = 8 callref = 0x00
Jan 29 02:55:50 172.200.95.1 283260: .Jan 29 02:54:30.392: ISDN BR2/2 Q921: User RX <- UI sapi=0 tei=127
Jan 29 02:55:58 172.200.95.1 283261: .Jan 29 02:54:30.392: ISDN BR2/2 Q931: MANAGEMENT_INFO pd = 8 callref = 0x00
Jan 29 02:56:32 172.200.95.1 283265: .Jan 29 02:54:31.490: ISDN BR2/2 Q921: User RX <- UI sapi=0 tei=127
Jan 29 02:56:41 172.200.95.1 283266: .Jan 29 02:54:31.490: ISDN BR2/2 Q931: MANAGEMENT_INFO pd = 8 callref = 0x00
Feb 8 09:29:34.579: ISDN BR2/2 Q921: User TX -> RR sapi=0 tei=81 nr=3
Feb 8 09:29:34.579: ISDN BR2/2 **ERROR**: host_information: Unexpected INFO - call id 0x0
Feb 8 09:29:34.603: ISDN BR2/2 Q921: User RX <- INFO sapi=0 tei=81, ns=3 nr=3
Feb 8 09:29:34.603: ISDN BR2/2 Q931: INFORMATION pd = 8 callref = N/A
Locking Shift to Codeset 6
Codeset 6 IE 0x22 i = 0x01
Codeset 6 IE 0x32 i = 0x01
Codeset 6 IE 0x3B i = 0x10
Feb 8 09:29:34.603: ISDN BR2/2 Q921: User TX -> RR sapi=0 tei=81 nr=4
Feb 8 09:29:34.603: ISDN BR2/2 **ERROR**: host_information: Unexpected INFO with no channel id - call id 0x0
Feb 8 09:29:35.040: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI2/2:1, changed state to down
Feb 8 09:29:35.040: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI2/2:2, changed state to down

Hi, the codes I gave are supposed to be 5ess commands to disable rex, thing that they did already for you.
If you can confirm that interface became unusable immediately after the packed above, you have captured the packet already.
I would not worry about bumping the CCME version just for a test. Newer IOS as still many bugfixes for ISDN. On the ISR, you can keep two images on flash and go back as required, however there are no compatibility issue.
As telco disabled the test now and probably will not press to reinstate it, you have resolved but if the bug exist and is not know, that would benefit all the cisco users.

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