Dear Experts,
Please give me any comments by the end of the business day Tuesday.
I found possible bugs in H.245 Generic Parameter when I was checking EVRC RTP payload format defined in H.225.0 version 4. I started checking because a complete different RTP payload format was proposed and discussed in the last IETF AVT WG meeting.
I believe that each H.245 Generic Parameter should clearly be identified as collapsing or non-collapsing because ASN.1 syntax treats differerently. But, Annex F (Logical Channel Bit Rate Management), Annex J (TDMA ACELP), K (TDMA US1), L (CDMA EVRC) and Example of H.261 do not have any description on collapsing or non-collapsing.
The bug may cause an interoperability problem between different implementations because transmitter side can encode a parameter as either collapsing or non-collapsing, and there is no explicit decoding rule for receiver side.
Has anyone there implemented TDMA or CDMA codec into H.323?
Best regards,
Hideh
Hidenobu Harasaki harasaki@bq.jp.nec.com (harasaki@ccm.cl.nec.co.jp) Senior Manager Computer & Communication Media Research NEC Corporation Phone: +81 44 856 8083 Fax: +81 44 856 2232
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