| a=X‑predecbufsize | a=X‑initpredecbufperiod | a=X‑initpostdecbufperiod | a=X‑decbyterate | a=3gpp‑videopostdecbufsize | a=framesize | a=3GPP‑Integrity‑Key | a=3GPP‑SRTP‑Config | a=3GPP‑SDP‑Auth | a=alt | a=alt‑default‑id | a=alt‑group | a=3GPP‑Adaptation‑Support | a=3GPP‑QoE‑Metrics | a=3GPP‑Asset‑Information |