Try this - *Polycom -* Add this to your config file. This will cause the phone to respond with a '400 bad request' unless the INVITE comes from the registrar. voIpProt.SIP.requestValidation.1.request="INVITE" voIpProt.SIP. requestValidation.1.method="source" *Adtran (Only applies to the local SIP stack (voice users, trunks etc) ) * Add an ACL, which only lists your proxy/SBC IPs ip access-list standard my-proxy remark MY IP SPACE permit x.x.x.x y.y.y.y log !Apply the ACL as a sip access-class ip sip access-class my-proxy in On Tue, Nov 12, 2013 at 4:37 PM, Jay Hennigan <jay at west.net> wrote:
We operate a hosted VoIP platform using Broadworks and over 90% Polycom phones. We have a number of customers at diverse locations recently reporting dead-air calls. These typically come from a source ANI of 100 or 7070 and have no audio.
Most of the phones are behind Adtran TA900 series IADs with NAT and a SIP access list allowing only our own SBCs.
The calls don't show up in our SBC logs, nor do they show in the MOS graphs on the Adtran voice quality monitoring.
Any ideas or suggestions on what is causing this or how to stop it?
-- -- Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV _______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org https://puck.nether.net/mailman/listinfo/voiceops