ISDN switch-type changes after router reload :/

[swharvey]

We have a 2821xm router on IOS 12.3(14)T7 that is an MGCP voice gateway. The router has 1 T1 PRI ckt on a VWIC-1MFT-T1=. The ISP says the ISDN switch-type should be primary-ni. I changed the setting globally and on the Serial interface and saved the config (tried both write mem and copy run start). When the router is reloaded the isdn switch-type changes to dms-100 both globally and on the interface. Wierd!!! Anyone ever seen that and more importantly know what the problem is? Thx in advance...

[b.hsu]

The details regarding the preservation of configurations in router memory can be found in the following url,

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/fun_c/fcprt2/fccfgfil.htm

[swharvey]

Thanks for the link, but that wasn't the problem. The router is an mgcp voicegateway, so Call Manager was pushing configs for the linecode, framing, and isdn switch-type.

I resolved the router config issue, but the T1 controller continues to have incrementing line code violation errors.