[OpenSER-Users] Insert a Header into ACK message

[nick]

凌芳瑜 wrote:
> Dear All:
> I've tried many methods to add Max-Forwarsd header into ACK message 
> (message 8), all methods I tried were fail.
> According to RFC 3261 8.1.1.6, Max-Forwards must exist in this ACK 
> message. Can anyone tell me how to add a header into ACK message? Thank 
> you very much.
> 
>     UA11     :   NUT(Proxy 1) :       UA12
>      |       :        |       :        |
>      |-------:------->|       :        | 1. INVITE
>      |<------:--------|       :        | 2. 407
>      |-------:------->|       :        | 3. ACK
>      |       :        |       :        |
>      |-------:------->|       :        | 4. INVITE
>      |       :        |-------:------->| 5. INVITE
>      |<------:--------|       :        | 6. 100
>      |       :        |       :        |
>      |       :        |<------:--------| 7. 486 (Busy Here)
>      |       :        |       :        |
>      |       :        |-------:------->| 8. ACK
>      |       :        |       :        |
>      |<------:--------|       :        | 9. 486
>      |       :        |       :        |
>      |-------:------->|       :        |10. ACK
>      |       :        |       :        |
> 
> Best Regards,
> Fangyu Ling
> 
> 
> 
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> 
if(is_method "ACK") && !search(Max-Forwards:)){
insert_hf("Max-Forwards: X ", "" )
};

Something like this (I guess you'll need a number in the max forwards
header, etc)in the correct place (look at the documentation for
insert_hf()) should do the job..