cvapCodecConfigDtmfRelay
1.3.6.1.4.1.9.9.323.1.1.2.1.10
When this object is set to 'true', the digits will be
sent as peer-to-peer packet in the bearer.
When this object is set to 'false', the digits will be
sent as regular voice packets in the bearer.
For low complexity CODECS (such as G.711), the preferred
value for this object could be 'false'.
For high complexity CODECS (such as G.729A), the preferred
value for this object should be 'true', otherwise
the digits may not get recognized properly at the remote
end.