Added function sipreg_laddr() (#67)

include/re_sipreg.h

@@ -13,3 +13,5 @@ int sipreg_register(struct sipreg **regp, struct sip *sip, const char *reg_uri,
 		    int regid, sip_auth_h *authh, void *aarg, bool aref,
 		    sip_resp_h *resph, void *arg,
 		    const char *params, const char *fmt, ...);
+
+const struct sa *sipreg_laddr(const struct sipreg *reg);

src/sipreg/reg.c

@@ -392,3 +392,16 @@ int sipreg_register(struct sipreg **regp, struct sip *sip, const char *reg_uri,
 
 	return err;
 }
+
+
+/**
+ * Get the local socket address for a SIP Registration client
+ *
+ * @param reg SIP Registration client
+ *
+ * @return Local socket address
+ */
+const struct sa *sipreg_laddr(const struct sipreg *reg)
+{
+	return reg ? &reg->laddr : NULL;
+}