diff --git a/core/AmSipHeaders.h b/core/AmSipHeaders.h
index 033fb5e5..599a5cd9 100644
--- a/core/AmSipHeaders.h
+++ b/core/AmSipHeaders.h
@@ -14,6 +14,7 @@
 #define SIP_HDR_SERVER          "Server"
 #define SIP_HDR_USER_AGENT      "User-Agent"
 #define SIP_HDR_MAX_FORWARDS    "Max-Forwards"
+#define SIP_HDR_P_ASSERTED_IDENTITY "P-Asserted-Identity"
 
 #define SIP_HDR_COL(_hdr)       _hdr ":"
 #define SIP_HDR_COLSP(_hdr)     SIP_HDR_COL(_hdr) " "