G721
if ((tofmt != G721) && (tofmt != G723))
case G721:
if ((ihdr.encoding != G721) && (ihdr.encoding != G723))
(ihdr.encoding != G721) &&
(ohdr.encoding != G721) &&
case G721:
case G721:
encoding = G721;
case G721:
case G721:
case G721:
case G721:
case G721: