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You may also specify a value for ignore_early_media in the argument to the bridge application, using the { } syntax. (ignore_early_media may not be specified on a per-leg basis, using the [ ] syntax, as it specifically is a global variable to the originate session.)
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1:应答 ignore_early_media=true
2:回铃 ignore_early_media=false 183
         ignore_early_media=ring_ready 180
Ignoring Ring Ready (180)
You can ignore ring ready (180) but still "react" when receiving a 183 with media:
{ignore_early_media=ring_ready}sofia/internal/user@domain
Note:
ignore_early_media=ring_ready works the same way as ignore_early_media=true, but it also sends 180 to the inbound leg when the first 183 is caught.