Au passage, petite question sur le SIP d'OVH, asterisk envoi une trame de type OPTIONS avec certaines info (Zoiper les envoie directement dans al trame de REGISTRATION) mais le serveur SIP OVH semble ne pas connaitre le terme OPTION :

[Nov 5 10:29:32] VERBOSE[1016] chan_sip.c: Reliably Transmitting (NAT) to 91.121.129.20:5060:
OPTIONS sip:sip.ovh.fr SIP/2.0
Via: SIP/2.0/UDP XX.XX.XX.XX:5060;branch=z9hG4bK5fe767f1;rport
Max-Forwards: 70
From: "Unknown" <sip:Unknown@XX.XX.XX.XX>;tag=as18034ad2
To: <sip:sip.ovh.fr>
Contact: <sip:Unknown@XX.XX.XX.XX>
Call-ID: 2cdca2e827d6233726cd8e4b7a7f3a75@XX.XX.XX.XX
CSeq: 102 OPTIONS
User-Agent: Aastra 6730i/2.6.0.1007
Date: Tue, 05 Nov 2013 09:29:32 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Content-Length: 0
[Nov 5 10:29:32] VERBOSE[1016] chan_sip.c:
<--- SIP read from UDP:91.121.129.20:5060 --->
SIP/2.0 501 Not Implemented
Call-ID: 2cdca2e827d6233726cd8e4b7a7f3a75@XX.XX.XX.XX
CSeq: 102 OPTIONS
From: "Unknown" <sip:Unknown@XX.XX.XX.XX>;tag=as18034ad2
To: <sip:sip.ovh.fr>;tag=00-25727-47d888c5-0bea85925
Via: SIP/2.0/UDP XX.XX.XX.XX:5060;received=XX.XX.XX.XX;rport=55822; branch=z9hG4bK5fe767f1
Content-Length: 0
Aucun risque de dysfonctionnement ?