no need to enable RIP for the routing
static route is enough
from the show crypto ipsec sa I can see that packets are comming from client and our ASA is decapsulating it , but there is no reply .
disable any firewall i n 192.168.1.20 and try ping .
did u apply the below configs in asa ( just for my knowledge)
access-list Split extended permit ip 192.168.1.0 255.255.255.0 any
access-list Split extended permit ip 192.168.115.0 255.255.255.0 any
group-policy tietogroup_1 attributes
split-tunnel-policy tunnelspecified
split-tunnel-network-list value Split