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...rrors as following: Oct 6 10:57:45 NOTICE[11026]: channel.c:1409 ast_read: Dropping incompatible vo ice frame on Local/1604xxx8621@hk-8073,2 of format gsm since our native format h as changed to g729 Oct 6 10:57:45 NOTICE[11032]: channel.c:1409 ast_read: Dropping incompatible vo ice frame on Local/xxx25837550@van-c9ae,2 of format ulaw since our native form at has changed to slin I searched the list and found similar topic on http://lists.digium.com/pipermail/asterisk-users/2005-May/104942.html, and used their advice by adding "Answer" before "Dial" in extensions.conf, and "canr...