diff --git a/src/mod/endpoints/mod_iax/mod_iax.c b/src/mod/endpoints/mod_iax/mod_iax.c
index cd967705e8..ac5c8f0658 100644
--- a/src/mod/endpoints/mod_iax/mod_iax.c
+++ b/src/mod/endpoints/mod_iax/mod_iax.c
@@ -129,6 +129,7 @@ static struct ast_iana AST_IANA[] = { {AST_FORMAT_G723_1, 4, "g723.1"},
 {AST_FORMAT_SLINEAR, 10, "slinear"},
 {AST_FORMAT_LPC10, 7, "lpc10"},
 {AST_FORMAT_G729A, 18, "g729"},
+{AST_FORMAT_SPEEX, 97, "speex"},
 {AST_FORMAT_SPEEX, 98, "speex"},
 {AST_FORMAT_ILBC, 102, "ilbc"},
 {AST_FORMAT_MAX_AUDIO, 999, ""},