Omada ER707-M2 VPN (Initiator)
1.WAN IP Type:Static IP
2.Authen Key Type:Preshared Key
3.Remote Gateway:WAN IP of NSF 3200A-I
4.Remote Subnet:Local subnet of NSF 3200A-I
5.IKEv2
6.Phase 1: Proposal:SHA1-AES128-DH5 Local ID Type:Name  Local ID:hntohq1 Remote ID Type:Name Remote ID:hqtohn1 SA Lifetime:28800 DPD:enable DPD interval:10
7.Phase 2: Encapsulation:Tunnel Mode Proposal:ESP-SHA1-AES128 PFS:dh5 SA Lifetime:28800

Sangfor NSF3200A-I
1.Peer IP Address Type:Static IP
2:Peer IP Address:WAN IP of ER707-M2
3.Authen Key Type:Preshared Key
4.Phase 1: Proposal:SHA1-AES128-DH5 Local ID Type:Name  Local ID:hntohq1 Remote ID Type:Name Remote ID:hqtohn1 SA Lifetime:28800 DPD:enable DPD interval:10
5.Phase 2: Proposal:ESP-AES128-SHA128-DH5

Still getting the error msg as below.
Phase 1 of IKE negotiation failed : Error = NO_PROPOSAL_CHOSEN[14])