asterisk users - Jun 2004 - (no subject)

Hi,

i am using iax client and when i try one of my extension that play MusicOnHold()

it give me this error, who have an idea about this

- Executing MusicOnHold("IAX2[1@1]/1", "") in new stack Jun
4 15:36:37 WARNING[1217602880]: chan_iax2.c:2838 iax2_send: timestamp is 0?
Jun 4 15:36:37 WARNING[1217602880]: channel.c:1445 ast_prod: Prodding channel
'IAX2[1@1]/1' failed

Any help would be really appreciate

Regards
JF