I am having some problems getting a router and a pbx to establish layer 2 connectivity. My t1 and D channel config is as follows
controller T1 1/1
pri-group timeslots 1-12,24
no ip address
no logging event link-status
isdn switch-type primary-4ess
isdn incoming-voice voice
no cdp enable
Whenever i do a sh isdn stat the layer two status says TEI_ASSIGNED and whenever i do a debug isdn q921 i get
ISDN Se1/1:23 Q921: User TX -> SABMEp sapi=0 tei=0
ISDN Se1/1:23 Q921: User RX <- BAD FRAME(0x00017F)
What could be the problem is it the router or the pbx, help would be greatly appreciated. Thanks.
Do you have the right ISDN switch type? Did you try toggling between the different types?
Which side is network and user side? By default router is user side.
What type of PBX?
The router is network side and providing the clocking, the pbx engineer had a hard time finding the switch type but its using primary-4ess. Its a mitel pbx.
This doc has come in very handy for troubleshooting: