Value,SRTP encr alg,Reference
0,NULL,[RFC3830]
1,AES-CM,[RFC3830]
2,AES-F8,[RFC3830]
3,SEED-CTR,[RFC5748]
4,SEED-CCM,[RFC5748]
5,SEED-GCM,[RFC5748]
6,AES-GCM,[RFC7714]
7,ARIA-CTR,[RFC8269]
8,ARIA-GCM,[RFC8269]
9-240,Unassigned,
241-255,Reserved for Private Use,