Hi All I have compiled the pjsip for symbian S60 3rd edition FP1 and trying to enalbe APS. I am using S60 Fp1 SDK and Carbide 2.0. After making all necessay changes in pjsip for APS integration.I am getting few errors: symb_mda_dev.cpp:(.text+0x4d4): undefined reference to `CMdaAudioInputStream::NewL(MMdaAudioInputStreamCallback&)' symb_mda_dev.cpp:(.text+0x584): undefined reference to `CMdaAudioInputStream::Open(TMdaPackage*)' \Symbian\9.2\S60_3rd_FP1_2\EPOC32\RELEASE\ARMV5\UREL\pjmedia_audiodev.lib(symb_mda_dev.o): In function `CPjAudioInputEngine::Stop()': symb_mda_dev.cpp:(.text+0x680): undefined reference to `CMdaAudioInputStream::Stop()' \Symbian\9.2\S60_3rd_FP1_2\EPOC32\RELEASE\ARMV5\UREL\pjmedia_audiodev.lib(symb_mda_dev.o): In function `CPjAudioInputEngine::MaiscOpenComplete(int)': symb_mda_dev.cpp:(.text+0x744): undefined reference to `CMdaAudioInputStream::SetPriority(int, TMdaPriorityPreference)' symb_mda_dev.cpp:(.text+0x764): undefined reference to `CMdaAudioInputStream::ReadL(TDes8&)' \Symbian\9.2\S60_3rd_FP1_2\EPOC32\RELEASE\ARMV5\UREL\pjmedia_audiodev.lib(symb_mda_dev.o): In function `CPjAudioInputEngine::MaiscBufferCopied(int, TDesC8 const&)': symb_mda_dev.cpp:(.text+0x95c): undefined reference to `CMdaAudioInputStream::ReadL(TDes8&)' \Symbian\9.2\S60_3rd_FP1_2\EPOC32\RELEASE\ARMV5\UREL\pjmedia_audiodev.lib(symb_mda_dev.o): In function `CPjAudioOutputEngine::StartPlay()': symb_mda_dev.cpp:(.text+0xd30): undefined reference to `CMdaAudioOutputStream::NewL(MMdaAudioOutputStreamCallback&, CMdaServer*)' \Symbian\9.2\S60_3rd_FP1_2\EPOC32\RELEASE\ARMV5\UREL\pjmedia_audiodev.lib(symb_mda_dev.o): In function `stream_get_cap(pjmedia_aud_stream*, pjmedia_aud_dev_cap, void*)': symb_mda_dev.cpp:(.text+0x16fc): undefined reference to `CMdaAudioInputStream::Gain() const' symb_mda_dev.cpp:(.text+0x1798): undefined reference to `CMdaAudioInputStream::MaxGain() const' \Symbian\9.2\S60_3rd_FP1_2\EPOC32\RELEASE\ARMV5\UREL\pjmedia_audiodev.lib(symb_mda_dev.o): In function `stream_set_cap(pjmedia_aud_stream*, pjmedia_aud_dev_cap, void const*)': symb_mda_dev.cpp:(.text+0x18d4): undefined reference to `CMdaAudioInputStream::SetGain(int)' symb_mda_dev.cpp:(.text+0x18ec): undefined reference to `CMdaAudioInputStream::MaxGain() const' What changes require to remove these errors.Thanks in advance. Regards Amit