Add SIP service into system server.

Change-Id: Icc39e4e54768cfdcc1b20a3efe6206009b9a8d10
diff --git a/Android.mk b/Android.mk
index af50134..b6f2504 100644
--- a/Android.mk
+++ b/Android.mk
@@ -182,6 +182,10 @@
 	wifi/java/android/net/wifi/IWifiManager.aidl \
 	telephony/java/com/android/internal/telephony/IExtendedNetworkService.aidl \
 	vpn/java/android/net/vpn/IVpnService.aidl \
+	voip/java/android/net/sip/ISipSession.aidl \
+	voip/java/android/net/sip/ISipSessionListener.aidl \
+	voip/java/android/net/sip/ISipService.aidl
+#
 
 
 # FRAMEWORKS_BASE_JAVA_SRC_DIRS comes from build/core/pathmap.mk
@@ -567,6 +571,7 @@
 # ============================================================
 
 ext_dirs := \
+	../../external/nist-sip/java \
 	../../external/apache-http/src \
 	../../external/tagsoup/src