504 | | Negotiation of various AMR options in SDP is currently not supported. The AMR mode is locked to bandwidth-optimized, and when AMR with octet-aligned packet is received, the behavior is undefined. |
| 504 | - Negotiation of various AMR optional parameters in SDP is currently not supported. The RFC 3267 section 8.1 specifies a list of optional parameters for AMR/AMR-WB, however, the parameters supported by the IPP codecs are just {{{octet-align}}} and {{{mode-set}}}. |
| 505 | - Payload verification is missing. A sample case, when the AMR mode is locked, after a successful SDP negotiation, to bandwidth-optimized, but the incoming AMR payloads are actually octet-aligned, the behavior will be undefined. |