[asterisk-app-dev] Migrating ast_call_feature from Asterisk 11 to Asterisk 16

[Fernando Pardo]

Hello, everybody. I'm migrating a module I've developed for Asterisk 11 to
use it on Asterisk 16. One of the trickiest parts I haven't found a way
around is the removal of the ast_call_feature struct, which I used to
execute a function on transfers.

This is what I do on Asterisk 11:

- Define a global 'ast_call_feature *my_feature_transfer'
- Define a callback function 'int TransferFromFeatureOperation(ast_channel
*chan, ast_channel *peer, ast_bridge_config*, const char*, int sense,
void*)'
- On module load, I initialize my_feature_transfer with:
  - feature_mask = AST_FEATURE_REDIRECT
  - fname = ast_strdup("Attended Transfer")
  - sname = "my_att_transfer"
  - exten = 'T'
  - default_exten = 'T'
  - operation = &TransferFromFeatureOperation
  - flags = AST_FEATURE_FLAG_NEEDSDTMF
  ... and register it with 'ast_register_feature(icc_feature_transfer);'
- On module unload, I call 'ast_unregister_feature(icc_feature_transfer)'
and free fname.

What would be the way to migrate this to Asterisk 16? I think it has
something to do with aco_option_register, but I'm not sure.

Best regards,
Fernando Pardo
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