We use Cisco call manager v3.1 and have problem of “False answer supervision”?

Cisco manager problem V3.1
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We use Cisco call manager v3.1 and have problem of “False answer supervision”?

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The Cisco Call Manager v3.1 is a Gate Keeper and it works with our VoIP Gateways. There is a known problem that is “False Answer Supervision” it means that call manager don’t know when the called party answer the phone. It immediately starts to count the duration. The solution can be as follows: There is different for FXO and FXS in response of the H.323 connect signal. FXS connect to Telephone set directly, it response connect signal when user pick up phone. Then start to bill accounting. FXO connect to PBX or PSTN system, it response connect signal when FXO detect connected with PBX. So it is almost like you start to dial but start to billing accounting. The solution is only to set delay time of valid_call_timer of FXO port. For example 30 seconds. It is not exactly as you want to response connect signal when called partner pick up phone. But the process almost closes its result, As: 1. When called party pick up phone within 30 seconds, it sends back connect signal at that time, meet

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