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I think that using RTP (SRTP) will add too much overhead eventhough it would make seamless handover of VoIP calls from CSD to Wifi straightforward.

see: Choosing VoIP: Data vs. overhead considerations


Yes I think there are two main issues too hand.

Making VOIP calls over the CSD line will not be possible for the specified reason. Therefore, it may be worthwhile examining the cryptofone implementation as a possible means to implementing a solution over the CSD. As far as I am aware they have appropriate measures to tackle the latency and low bandwidth constraints.

Making VOIP calls over EDGE or GPRS may be more suited?