[SR-Users] Copy reason field from 503 to 500.

[Vitaliy Aleksandrov]

Hi all,

I have Kamailio connected to PSTN gateway.

Sometimes gateway replies with "503 temporary unavailable". PSTN gateway 
adds a "reason" header with ISUP code.
But according to RFC 3261 kamailio doesn't forward 503 replies 
transparently. When 503 reply is received Kamailio replaces 503 with a 
500 which is created from original request (build_res_buf_from_sip_req).
I have tried append_hf from textops module, but it's not working with a 
locally generated replies.

How can i copy Reason header from 503 to 500 ?


I will appreciate your help with this situation.

Best regards,
     Vitaliy Aleksandrov.