your trace shows only outbound LCP CONFREQ messages and no inbound messages. This could be caused by an ISDN speed mismatch. Possibly your local or remote circuit does not support the 64K default speed.
Try to configure a map class (for dialer profiles), or adjust your dialer map statement (for legacy DDR) on both sides of the circuit.
Here is an example from CCO on how to configure this:
For Dialer Profiles:
maui-soho-01(config-if)#dialer string 81560 class 56k! -- Dial 81560 and use the map-class named "56k" (defined below)
maui-soho-01(config)#map-class dialer 56k! -- map-class named "56k" that was used with the dialer string in int Dialer1maui-soho-01(config-map-clas)#dialer isdn speed 56! -- Set the speed of the call to be 56k (default is 64k)
For Legacy DDR (dialer maps):
maui-soho-01(config)#interface bri 0
maui-soho-01(config-if)#dialer map ip 10.1.1.1 name maui-nas-08 speed 56 81560
!-- The keyword speed 56 sets the outgoing call rate at 56k
Also, check if all interfaces (physical and dialer) are configured for ppp encapsulation.
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