Their phones could run skinny to UC500 and then the UC500 have a SIP trunk out … any options to get rid of NAT all together? Also, on firewall check for SIP ALG on/off – toggle it to see if any effect.
Do you run a softswitch such as Metaswitch by chance? In Meta, you can do a SAS trace which will show you the traffic and probably indicate further where the problem may be… From: Af [mailto:[email protected]] On Behalf Of Lewis Bergman Sent: Friday, April 3, 2015 9:31 AM To: [email protected] Subject: Re: [AFMUG] SIP Trunks w/ Cisco UC-500 Strange. Are their phone configured for skinny instead of sip? That dead air and busy usually indicates an incorrect response if I remember correctly. Where is that phone guru Chuck? On Apr 3, 2015 8:08 AM, "Keefe John" <[email protected] <mailto:[email protected]> > wrote: We have a customer trying to configuring their UC-500 Phone system with our SIP Trunks. They can't seem to figure it out and we're not UC-500 experts. Their system registers to our server but incoming calls get dead air for 60 seconds, then ring once, then an all circuits are busy error. At first they thought it might be NAT related so they setup 1:1 NAT with wide open firewall rules and it does the same thing. Any advice would be greatly appreciated! Thanks, Keefe
