-Other then dot1q tunneling another way to achieve q-in-q is vlan stacking . I never used this feature myself and do not have 2900 platform handly to test on it yet , but you can try below configuration to achieve it :
(apply similar configuration on other end accordingly )
# Interface gi0/0
No ip address
#Int gig 0/0.20
Encapsulation dot1q 10 second 20
Ip address 10.0.20.1 255.255.255.0
Int gig 0/0.30
Encapsulation dot1q 10 second 30
ip address 10.0.30.1 255.255.255.0
So in above configuration vlan 10 is outer vlan id which will be used to transport customer traffic through service provider environment untill far end PE router ( where similar set of configuration will ensure inner vlan id 20/30 to send traffic towards CE device ) .
You may refer below documentation for this feature and prerequisites :
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