Hi all, i was trying to configure isdn using a teltone simulator everything worked fine and checked out till I tried to ping the other router. i am send two outputs below for claification. As I got it the spid numbers are not rightly configured. By the way they say with the switch the spid1: 0835866101, DN: 835-8661 spid2: 0835866301 DN: 835-8663 this what I entered exactly. but they say you can configure 1-800-835-8661 and as 1-800-835-8663 the DN also what should I do? Any help is welcome. Omer The current ISDN Switchtype = basic-ni1 ISDN BRI0 interface Layer 1 Status: ACTIVE Layer 2 Status: TEI = 96, State = MULTIPLE_FRAME_ESTABLISHED TEI = 97, State = MULTIPLE_FRAME_ESTABLISHED Spid Status: TEI 96, ces = 1, state = 5(init) spid1 configured, spid1 sent, spid1 valid Endpoint ID Info: epsf = 0, usid = 2, tid = 1 TEI 97, ces = 2, state = 8(established) spid2 configured, spid2 sent, spid2 NOT valid Layer 3 Status: 0 Active Layer 3 Call(s) Activated dsl 0 CCBs = 1 CCB: callid=0x0, sapi=0, ces=1, B-chan=0 Total Allocated ISDN CCBs = 1 FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]