fix issue: DTMF packets have different timestamps and support byealso#10

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jiafu1115 wants to merge 5 commits intoymartineau:masterfrom jiafu1115:master

+128-35

Commits on Aug 4, 2015

fix issue: DTMF packets have different timestamps
fujian1115
committed

Commits on Aug 17, 2015

Commits on Aug 19, 2015

Support bye-Also
fujian1115
committed

Commits on Aug 28, 2015

fix issue: latter 4 dtmf timestamp:0
fujian1115
committed