Je retombe sur l'erreur que j'avais au début donc mon soucis doit être purement réseau ...

Quand je regarde les appels reçu on voit qu'ils passent une "probation" mais pas les appels sortant.

Code:
Connected to Asterisk 11.7.0~dfsg-1+b1 currently running on ipbx-v2 (pid = 19988)
  == Using SIP RTP CoS mark 5
    -- Executing [00603357850@users:1] Dial("SIP/34-00000000", "SIP/ovh-out/0603357850,,r") in new stack
  == Using SIP RTP CoS mark 5
    -- Called SIP/ovh-out/0603357850
       > Saved useragent "C610 IP/42.075.00.000.000" for peer 31
[Mar 13 17:01:23] WARNING[20021]: chan_sip.c:4175 retrans_pkt: Retransmission timeout reached on transmission 04e06f5c382749ed035a740c48cfaacf@80.12.90.15:5060 for seqno 102 (Critical Request) -- See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 6400ms with no response
[Mar 13 17:01:23] WARNING[20021]: chan_sip.c:4204 retrans_pkt: Hanging up call 04e06f5c382749ed035a740c48cfaacf@80.12.90.15:5060 - no reply to our critical packet (see https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions).
  == Everyone is busy/congested at this time (1:0/0/1)