Change "SIP address" to "Internet call" to match UI spec.

Change-Id: Ie02d2aae5623ff70be95a48237f3ffaae6e8d37f
diff --git a/res/values/strings.xml b/res/values/strings.xml
index e556dcd..6a50adb 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -194,7 +194,7 @@
     <string name="label_notes">Notes</string>
 
     <!-- The label describing the SIP address field of a contact. [CHAR LIMIT=20] -->
-    <string name="label_sip_address">SIP address</string>
+    <string name="label_sip_address">Internet call</string>
 
     <!-- The label describing the custom ringtone for a contact -->
     <string name="label_ringtone">Ringtone</string>