In modules/rtpengine/rtpengine.c:

>  	}
>  
>  	if (body_out)
>  		*body_out = body;
>  
> +	if (op == OP_DELETE) {
> +		/* Delete the key<->value from the hashtable */
> +		if (!rtpengine_hash_table_remove(&callid)) {

Some notes:

• when session is created, there is no to-tag (initial invite)
• the via-branch can be different for re-invite or bye, so it cannot be used as part of the key all the time

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