How to change individual T1 clocking source on ISE OC12 channellized card

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How to change individual T1 clocking source on ISE OC12 channellized card.

Cisco GSR#sh gsr
Slot 0  type  = Modular SPA Interface Card
        state = IOS RUN   Line Card Enabled
        subslot 0/0: SPA-1X10GE-L-V2 (0x50C), status is ok
        subslot 0/1: SPA-4XT3/E3 (0x40B), status is ok
        subslot 0/2: SPA-4XT3/E3 (0x40B), status is ok
        subslot 0/3: SPA-4XT3/E3 (0x40B), status is ok
Slot 1  type  = 1 Port ISE OC12 Channelized to DS1/E1   <=====
        state = IOS RUN   Line Card Enabled

Cisco GSR#sh controllers sonet 1/0.1 brief
:

:

 STS-1 1, T1 15 (CT3 1/15) is down
  timeslots: 1-24
  FDL per AT&T 54016 spec.
  Receiver has no alarms.
  Framing is ESF, Clock Source is Internal

Cisco GSR(config)#
Cisco GSR(config)#controller SONET 1/0
Cisco GSR(config-controller)#sts-1 1
Cisco GSR(config-ctrlr-sts1)#t1 15 clock source line

Now, it changed to "clocking source line"

Cisco GSR#sh controllers sonet 1/0.1 brief
:

:

 STS-1 1, T1 15 (CT3 1/15) is down
  timeslots: 1-24
  FDL per AT&T 54016 spec.
  Receiver has no alarms.
  Framing is ESF, Clock Source is Line