MNCC ABI changes

Hi, as part of looking into early media (and at some point handover handling) I would like to use MNCC_RTP_CONNECT and supply "recvonly", "sendonly" attributes. The gsm_mncc_rtp structure does not carry this information though. struct gsm_mncc_rtp { uint32_t msg_type; uint32_t callref; uint32_t ip; uint16_t port; uint32_t payload_type; uint32_t payload_msg_type; }; The content of payload_msg_type currently holds anything between 0x300 and 0x03ff and I would like to split this field into two uint16_t. The reason is not to change the size of the structure (and maybe not dump the protocol version). It would be a backward compatible change. Is anyone open for such tricks? Otherwise I will bump protocol version and change the ABI (and try to update the various active users of this protocol). holger