[Xperia SP General] trioset:
The logs are useful. An audio issue rather than a radio one?

03-31 21:44:46.811 D/ALSADevice(12938): startVoiceCall: handle 0xb7e5bba0
03-31 21:44:46.811 D/ALSADevice(12938): Device value returned is hw:0,2
03-31 21:44:46.811 D/ALSADevice(12938): handle->format: 0x2
03-31 21:44:46.811 D/ALSADevice(12938): setHardwareParams: reqBuffSize 2048 channels 1 sampleRate 8000
03-31 21:44:46.811 D/ALSADevice(12938): setHardwareParams: buffer_size 8192, period_size 2048, period_cnt 4
03-31 21:44:46.811 D/ALSADevice(12938): Device value returned is hw:0,2
03-31 21:44:46.811 D/ALSADevice(12938): handle->format: 0x2
03-31 21:44:46.811 D/ALSADevice(12938): setHardwareParams: reqBuffSize 2048 channels 1 sampleRate 8000
03-31 21:44:46.811 D/ALSADevice(12938): setHardwareParams: buffer_size 8192, period_size 2048, period_cnt 4
03-31 21:44:46.911 F/libc (12938): Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 12938 (mediaserver)
03-31 21:44:47.011 I/DEBUG ( 261): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
03-31 21:44:47.011 I/DEBUG ( 261): Build fingerprint: 'Sony/C5303/C5303:4.3/12.1.A.1.207/Nvt_nw:user/release-keys'
03-31 21:44:47.011 I/DEBUG ( 261): Revision: '0'
03-31 21:44:47.011 I/DEBUG ( 261): ABI: 'arm'
03-31 21:44:47.011 I/DEBUG ( 261): pid: 12938, tid: 12938, name: mediaserver >>> /system/bin/mediaserver <<<
03-31 21:44:47.011 W/NativeCrashListener( 681): Couldn't find ProcessRecord for pid 12938
03-31 21:44:47.011 E/DEBUG ( 261): AM write failure (32 / Broken pipe)
03-31 21:44:47.011 I/DEBUG ( 261): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
03-31 21:44:47.021 I/DEBUG ( 261): r0 bea4e26c r1 00000000 r2 ffffffc8 r3 bea4e26c
03-31 21:44:47.021 I/DEBUG ( 261): r4 bea4e26c r5 bea4e290 r6 bea4e2a0 r7 bea4fd44
03-31 21:44:47.021 I/DEBUG ( 261): r8 bea4fd50 r9 bea50a80 sl bea4e2d0 fp bea4e288
03-31 21:44:47.021 I/DEBUG ( 261): ip b654deac sp bea4e238 lr b6542749 pc b653dba0 cpsr 400f0030
03-31 21:44:47.021 I/DEBUG ( 261):
03-31 21:44:47.021 I/DEBUG ( 261): backtrace:
03-31 21:44:47.021 I/DEBUG ( 261): #00 pc 00012ba0 /system/lib/libaudiopolicymanagerdefault.so (android::sp<android::AudioPolicyManager::AudioPort>::sp<android::AudioPolicyManager::IOProfile>(android::sp<android::AudioPolicyManager::IOProfile> const&)+3)
03-31 21:44:47.021 I/DEBUG ( 261): #01 pc 00017745 /system/lib/libaudiopolicymanagerdefault.so (android::AudioPolicyManager::updateCallRouting(unsigned int, int)+556)
03-31 21:44:47.021 I/DEBUG ( 261): #02 pc 00017db5 /system/lib/libaudiopolicymanagerdefault.so (android::AudioPolicyManager::setPhoneState(audio_mode_t)+596)
03-31 21:44:47.021 I/DEBUG ( 261): #03 pc 0000984f /system/lib/libaudiopolicyservice.so
03-31 21:44:47.021 I/DEBUG ( 261): #04 pc 0006a1ff /system/lib/libmedia.so (android::BnAudioPolicyService::onTransact(unsigned int, android::Parcel const&, android::Parcel*, unsigned int)+262)
03-31 21:44:47.021 I/DEBUG ( 261): #05 pc 000189c9 /system/lib/libbinder.so (android::BBinder::transact(unsigned int, android::Parcel const&, android::Parcel*, unsigned int)+60)
03-31 21:44:47.021 I/DEBUG ( 261): #06 pc 0001d97f /system/lib/libbinder.so (android::IPCThreadState::executeCommand(int)+582)
03-31 21:44:47.021 I/DEBUG ( 261): #07 pc 0001daa3 /system/lib/libbinder.so (android::IPCThreadState::getAndExecuteCommand()+38)
03-31 21:44:47.021 I/DEBUG ( 261): #08 pc 0001dae5 /system/lib/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+48)
03-31 21:44:47.021 I/DEBUG ( 261): #09 pc 000019fb /system/bin/mediaserver
03-31 21:44:47.021 I/DEBUG ( 261): #10 pc 0000f509 /system/lib/libc.so (__libc_init+44)
03-31 21:44:47.021 I/DEBUG ( 261): #11 pc 00001c70 /system/bin/mediaserver
03-31 21:44:47.362 I/DEBUG ( 261):
03-31 21:44:47.362 I/DEBUG ( 261): Tombstone written to: /data/tombstones/tombstone_09