The resource unavailable means, the requested channel or service is
unavailable for an unknown reason.
The problem might be due to a couple of resons.
1. which side disconnect the call with this reason
in which direction.
2. You might be requesting bchannels in ascending while the swicth
is hoping to allocate b-channel in decending manner, hence swicth will reject the cal with
requested channel unavailable.
try using the command "isdn bchan-number-order ascending / decending" to twaek
this and see.
3. The companding type might not be properly matched.
are you sent for A-law or U-law. Verify from the swicth administrator.
4. Are the swicth b-channel set to 56K or 64K. verify this as well and this can be twaeked with the
command.
annc(config-if)#isdn incoming-voice modem ?
56 B Channel Bandwidth of 56Kb/s
64 B Channel Bandwidth of 64Kb/s