[Xoom Android Development] xlanhackerx:
Looool I´v got a great first Result -> Telephony Call (Voice doesn´t) work -> DTMF Tones !

I modded my build.prop and also flash SMS Mod to enable phone:

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=JRO03L
ro.build.display.id=EOS JRO03L Nightly 108+ (58c8c40)
ro.build.version.incremental=108
ro.build.version.sdk=16
ro.build.version.codename=REL
ro.build.version.release=4.1.1
ro.build.date=Thu Aug 23 09:35:48 PDT 2012
ro.build.date.utc=1345739748
ro.build.type=userdebug
ro.build.user=buildslave
ro.build.host=cyclone
ro.build.tags=test-keys
ro.product.model=MZ601
ro.product.brand=MOTO
ro.product.name=RTCOREEU
ro.product.device=umts_everest
ro.product.board=
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=motorola
ro.product.locale.language=en
ro.product.locale.region=US
ro.wifi.channels=
ro.board.platform=tegra
# ro.build.product is obsolete; use ro.product.device
ro.build.product=umts_everest
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=umts_everest-user 3.2 H.6.5-17-3 1321319666 ota-rel-keys,release-keys
ro.build.fingerprint=MOTO/RTCOREEU/umts_everest:3.2/H.6.5-17-3/1321319666:user/ota-rel-keys,release-keys
ro.build.characteristics=tablet
# end build properties
# RIL and telephony related settings
rild.libpath=/system/lib/libmoto_ril.so
rild.libargs=-d /dev/ttyUSB2

persist.ril.mux.ttydevice=/dev/ttyUSB2
persist.ril.mux.noofchannels=8
persist.ril.modem.mode=1
persist.ril.modem.ttydevice=/dev/ttyUSB4
persist.ril.features=0x34

persist.radio.sms_sync_sending=true
ro.telephony.support_network=0,1,2,3

ro.telephony.call_ring.multiple=false
ro.telephony.default_network=7
persist.ril.tcmd.ttydevice=/dev/ttyUSB3

# The OpenGL ES API level that is natively supported by this device.
# This is a 16.16 fixed point number
ro.opengles.version = 131072

# Indicate carrier OTA SP number schema
# refer to frameworks/base/telephony/java/com/android/
# internal/telephony/cdma/CDMAPhone.java for the schema:
#ro.cdma.otaspnumschema=SELC,1,80,99

# UA profile
ro.mot.hw.uaprof=http://uaprof.motorola.com/phoneconfig/motomz601/Profile/motomz601.rdf

# BP flex version
ro.build.bp.config.version=UCAEVEUB1B8EU03F.0R

# Google use the system property to control if allow device to be unlock without SIM
keyguard.no_require_sim=true

drm.service.enabled=true

ro.use_data_netmgrd=true

ro.bluetooth.remote.autoconnect=true
ro.qualcomm.bluetooth.ftp=true
ro.bluetooth.request.master=true

ro.ril.transmitpower=true

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.com.android.dateformat=MM-dd-yyyy
ro.config.ringtone=Ring_Synth_04.ogg
ro.config.notification_sound=pixiedust.ogg
ro.carrier=unknown
ro.config.alarm_alert=Alarm_Classic.ogg
wifi.interface=wlan0
ro.sf.lcd_density=160
dalvik.vm.heapstartsize=5m
dalvik.vm.heapgrowthlimit=48m
dalvik.vm.heapsize=256m
ro.eos.majorversion=2
ro.goo.developerid=teameos
ro.goo.board=umts_everest
ro.goo.rom=eosJBNightlies
ro.goo.version=1345739717
dalvik.vm.lockprof.threshold=500
dalvik.vm.dexopt-flags=m=y
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt

So it´s seems to be that Sound transported to MDM6600 (Modem) so we have now to figure out how to integrated Mic and Speaker !!

@bigrushdog : Do you think could be Kernel Part ?