I have my software vendor installing an adtran 908e rounter with two bonded t1's for voice. Supposedly it should be a PRI handoff from the router. My question is how to I plug this into my Cisco 2800. Will they hand me two serial ports off the Adtran to connect to 2 serial ports on my Cisco 2800? Any help is much appreciated. Haven't been able to talk to anyone who has any idea at my Comm provider.