[OpenSIPS-Users] OpenSIPS : no 407 retransmission

[Yannick LE COENT]

Hello,

I'm using OpenSIPS as a proxy in front of another proxy. The 2nd proxy 
is in charge of authenticating the request.

This is the callflow:

Alice           OpenSIPS          Proxy#2
   | INVITE         |                |
   |--------------->| INVITE         |
   |      100 Tring |--------------->|
   |<---------------|            407 |
   |                |<---------------|
   |                | ACK            |
   |                |--------------->|
   |            407 |                |
   |     X<---------|                |
   |                |                |

Since OpenSIPS does not retransmit 401/407, the call setup gets stuck.

What can I do ?
If I set auto_100trying=1, that works, but this increases the number of 
INVITE retransmissions since 180Ringing are not received instantly.

Do you have any suggestion ?

Thanks,
Yannick