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-rw-r--r--channels/chan_iax2.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index d594498f6..fd71e3acc 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -4087,6 +4087,10 @@ static int iax2_setoption(struct ast_channel *c, int option, void *data, int dat
/* these two cannot be sent, because they require a result */
errno = ENOSYS;
return -1;
+ case AST_OPTION_FORMAT_READ:
+ case AST_OPTION_FORMAT_WRITE:
+ case AST_OPTION_MAKE_COMPATIBLE:
+ return -1;
case AST_OPTION_OPRMODE:
errno = EINVAL;
return -1;