res_musiconhold: Clarify that playlist mode only supports HTTP(S) URLs

Change-Id: I41e77a04e4a523f4ed61a7a20b738ffd42be441e

configs/samples/musiconhold.conf.sample

@@ -13,7 +13,7 @@
 ; valid mode options:
 ; files		-- read files from a directory in any Asterisk supported
 ;		   media format
-; playlist	-- provide a fixed list of filenames or URLs to play
+; playlist	-- provide a fixed list of filenames or HTTP(S) URLs to play
 ; quietmp3 	-- default
 ; mp3 		-- loud
 ; mp3nb		-- unbuffered
@@ -56,7 +56,7 @@
 ; Each entry must be one of:
 ;
 ;   * An absolute path to the file to be played, without an extension.
-;   * A URL
+;   * An HTTP(S) URL
 ;
 ; The entries are played in the order in which they appear in the
 ; configuration. The 'sort' option is not used for this mode.

res/res_musiconhold.c

@@ -1144,7 +1144,7 @@ static void moh_parse_options(struct ast_variable *var, struct mohclass *mohclas
 
 				AST_VECTOR_APPEND(playlist_entries, dup);
 			} else {
-				ast_log(LOG_ERROR, "Playlist entries must be a URL or absolute path, '%s' provided.\n", var->value);
+				ast_log(LOG_ERROR, "Playlist entries must be an HTTP(S) URL or absolute path, '%s' provided.\n", var->value);
 			}
 		} else if (!strcasecmp(var->name, "directory")) {
 			ast_copy_string(mohclass->dir, var->value, sizeof(mohclass->dir));