SBC path throught implementation

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Add custom endpoint implementation which will negotiate sdp based on UA's sdp 
received ( thus codecs received from first UA connection will be duplicated to 
second one ).

Original issue reported on code.google.com by yulia...@sipme.me on 20 Jul 2013 at 4:33

• Blocking: SBC announcement support #9, Add P2P video support #12, Add Video Conferencing support #14, Add Video SS7 Support #15

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Original comment by yulia...@sipme.me on 20 Jul 2013 at 4:33

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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Original comment by yulia...@sipme.me on 20 Jul 2013 at 4:42

• Added labels: Group-SBC

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Original comment by yulia...@sipme.me on 20 Jul 2013 at 4:42

• Now blocking: SBC announcement support #9

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Original comment by yulia...@sipme.me on 20 Jul 2013 at 4:46

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Original comment by yulia...@sipme.me on 20 Jul 2013 at 4:49

• Now blocking: Add P2P video support #12

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Original comment by yulia...@sipme.me on 20 Jul 2013 at 4:51

• Now blocking: Add Video Conferencing support #14

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Original comment by yulia...@sipme.me on 20 Jul 2013 at 4:52

• Now blocking: Add Video SS7 Support #15