CVoIPUtilityFactory is source incompatible between S60v3_fp1 and v5

[muchadhesion]

The class CVoIPUtilityFactory is source incompatible between S60v3_fp1 (extension SDK) and S60v5

In particular in voiputilityfactory.h in S60v3_fp1 contains the function
IMPORT_C TInt CVoIPUtilityFactory::CreateBuffer(CVoIPDataBuffer*& aBuffer, const CVoIPDataBuffer::TVoIPBufferType aType);
In S60v5 this is replaced with
IMPORT_C TInt CVoIPUtilityFactory::CreateBuffer(CVoIPDataBuffer*& aBuffer, const CVoIPDataBuffer::TVoIPBufferType aType, const TVoIPCodecFormat aCodecFormat = EG711);

Should I expect to be able to build a binary that works with both?

Any recommendations?

[symbianyucca]

is that part of the VAS ?, basically APIs in API plug-in are not coming with any compatibility promise, thus you need to do extensive testing to find out whether they work on devices you would want to use them in.