- Fixed pjmedia_frame_ext helper functions, it didn't involve sizeof(bitlen) in calculating subframe address.
 - Fixed audio switch board to handle such case that transmitter of port 0 has greater ptime, so it could save the remaining data in the TX buffer.
 - Fixed audio swtich board in handling FRAME_TYPE_NONE.
 - Updated audio switch board to handle keep alive mechanism.



git-svn-id: https://svn.pjsip.org/repos/pjproject/branches/projects/aps-direct@2437 74dad513-b988-da41-8d7b-12977e46ad98
2 files changed