This attribute specifies the desired negotiation between this
VoiceService and V.17 fax machines when modemFaxEncoding is
faxRelayG711G726. This attribute is not used unless
modemFaxEncoding is faxRelayG711G726.
The actual negotiation between this VoiceService and V.17 fax
machines is available in negotiatedV17AsG711G726.
If v17EncodedAsG711G726 is no, it is desired that V.17 fax
machines be instructed to use V.29 so that V.29 fax traffic sent by
fax machines can be demodulated and encoded using fax relay.
If v17EncodedAsG711G726 is yes, it is desired that V.17 fax
machines be permitted to use V.17 so that V.17 fax traffic sent by
fax machines can be encoded using G.711 or G.726. The actual
encoding performed depends on network congestion and the
negotiated ingress modemFax rates, available in negotiatedIgRates.