Some more observations/issues using PJSIP on iphone OS (3.1 and 4.0)

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Hello, we have the following observations. Any help would be great:

Version of PJSIP: 1.6

1) It seems when we compile PJSIP/MEDIA on iOS SDK 4.0, it works fine, but
media does not work (there is no sound) when we make a call. However the
moment we switch to iOS SDK 3.2 everything works fine. So right now, we are
building PJSIP on 3.2 - once built on 3.2, our application when deployed in
an iphone 3G (3.x) or iphone 4 (4.0.1) works fine. Our conclusion therefore
is that pj1.6 has some issues in the audio driver for iphone when compiled
with iOS SDK 4.0 - correct?

2) The PJSIP initialization function takes at least 10-12 seconds when in
debug mode on an iphone 4. Is there any way to make it faster? Alternately,
we do not receive any notification from PJ when init is complete, so when we
start our VoIP client, we have no idea when PJ is ready to make a call - so
we cannot display a "initializing" message that g goes away when PJ is ready
to make calls.

3) Has anyone got DTMF via RFC 2833 working on iphone? We currently use
PJSIP on android and everything works fine with 2833 DTMF. When we use the
iphone client, RTP seems to be sent via inband RTP and not 2833 (yes, we
have validated that the remote end returns 2833 support in 200 OK)
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