Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.4(3)M, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2014 by Cisco Systems, Inc.
Compiled Mon 21-Jul-14 17:38 by prod_rel_team

ROM: System Bootstrap, Version 15.0(1r)M16, RELEASE SOFTWARE (fc1)

BSD6454 uptime is 21 hours, 54 minutes
System returned to ROM by reload at 19:40:58 UTC Thu May 14 2015
System image file is "usbflash0:c1900-universalk9-mz.SPA.154-3.M.bin"
Last reload type: Normal Reload
Last reload reason: Reload Command

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Cisco CISCO1921/K9 (revision 1.0) with 487424K/36864K bytes of memory.
Processor board ID FTX184682KJ
2 Gigabit Ethernet interfaces
1 Serial interface
1 terminal line
2 Channelized T1/PRI ports
DRAM configuration is 64 bits wide with parity disabled.
255K bytes of non-volatile configuration memory.
249840K bytes of USB Flash usbflash0 (Read/Write)

License Info:

License UDI:

-------------------------------------------------
Device#   PID                   SN
-------------------------------------------------
*1        CISCO1921/K9          FTX184682KJ     

Technology Package License Information for Module:'c1900' 

------------------------------------------------------------------------
Technology    Technology-package                  Technology-package
              Current              Type           Next reboot  
------------------------------------------------------------------------
ipbase        ipbasek9             Permanent      ipbasek9
security      None                 None           None
data          None                 None           None
NtwkEss       None                 None           None

Configuration register is 0x2102

Under the command controller t1 add this line

channel-group 1 timeslots 1-24

HTH

Rick

nice rick! forgot that one :)

I do not understand what you are telling us in your most recent post which describes your final goal. Are you telling us that it is now working? Or are you telling us that for some reason  it is still not working?

Have you added the channel-group timeslot command that I suggested? That is the step at which the serial interfaces actually get created.

I believe that the card that you are using for serial interfaces will require configuration a bit different from what you describe as your final goal. In particular I believe that it will not use the service-module commands and the serial interface identification will be slightly different.

HTH

Rick

The above added final goal is what I am trying to accomplish.

I made the change channel-group 1 timeslots 1-24.

After this I see the Serial interface as S0/0/0:1.

Can I add the subinterface s0/0/0.777 now?

Yes. When you configure the channel-group is when you actually get the serial interfaces created. Now you should have no problem in configuring the subinterfaces under the serial interfaces that were created.

Note that the serial interface identifier might be a bit different from s0/0/0.777.

If you are not sure, or if you try it and it does not work, then post the output of show ip interface brief. That should clarify the serial interface identifier to which you add the subinterface.

HTH

Rick