--- pjsip/src/pjsip/sip_msg.c.bal       2016-01-23 01:01:19.502670330 +0300
+++ pjsip/src/pjsip/sip_msg.c   2016-01-23 01:03:18.365812210 +0300
@@ -251,7 +251,7 @@
 {
     unsigned i;
     for (i=0; i<PJ_ARRAY_SIZE(method_names); ++i) {
-       if (pj_memcmp(str->ptr, method_names[i]->ptr, str->slen)==0 ||
+       if (pj_memcmp(str->ptr, method_names[i]->ptr, (str->slen < method_names[i]->slen ? str->slen : method_names[i]->slen))==0 ||
            pj_stricmp(str, method_names[i])==0)
        {
            m->id = (pjsip_method_e)i;