calls from analog elevator phone on MPX unit dropping after call picked up on other end

[dbutler17]

Hello,
I have a few analog elevator phones attached to Audio Codes VOIP gateways, which are running to a Mitel 3300 controller. When I initiate a call on the elevator phone, it rings our front desk, they pick up and maybe get a second of speech in, then the call disconnects.

Here is an output of the log from the MPX unit:

23d:19h:5m:3s ( lgr_flow)(4042 ) ---- Outgoing SIP Message to X.X.1.1:5060 from SIPInterface #0 ---- 
23d:19h:5m:3s OPTIONS sip:8110@X.X.1.14 SIP/2.0 Via: SIP/2.0/UDP X.X.1.14;branch=z9hG4bKac1897177048 Max-Forwards: 70 From: ;tag=1c1897168231 To: Call-ID: 189716773023120001953@X.X.1.14 CSeq: 1 OPTIONS Contact: Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE User-Agent: Audiocodes-Sip-Gateway-/v.5.80A.023.006 Accept: application/sdp, application/simple-message-summary, message/sipfrag Content-Length: 0 
23d:19h:5m:3s ( sip_stack)(4044 ) UdpRtxMngr::Transmit 1 OPTIONS Rtx Left: 6 Dest: X.X.1.1:5060 CallID: (189716773023120001953@X.X.1.14) 
23d:19h:5m:3s ( sip_stack)(4045 ) Resource SIPMessage deleted - #7 
23d:19h:5m:3s ( sip_stack)(4046 ) New SIPMessage created - #0 
23d:19h:5m:3s ( lgr_flow)(4047 ) ---- Incoming SIP Message from X.X.1.1:5060 to SIPInterface #0 ---- 
23d:19h:5m:3s SIP/2.0 200 OK Via: SIP/2.0/UDP X.X.1.14;branch=z9hG4bKac1897177048 From: ;tag=1c1897168231 To: ;tag=0_4027322112-105556127 Call-ID: 189716773023120001953@X.X.1.14 CSeq: 1 OPTIONS Contact: Allow: INVITE,BYE,CANCEL,ACK,INFO,PRACK,OPTIONS,SUBSCRIBE,NOTIFY,REFER,REGISTER,UPDATE Content-Length: 0 
23d:19h:5m:3s ( lgr_flow)(4049 ) | |(SIPTU#16)200 OK State:DialogInitiated(189716773023120001953@X.X.1.14) 
23d:19h:5m:3s ( sip_stack)(4050 ) SIPDialog(#16) changes state from DialogInitiated to DialogConnected 
23d:19h:5m:3s ( lgr_flow)(4051 ) | |(SIPTU#16)DIALOG_DISCONNECT_REQ State:DialogConnected(189716773023120001953@X.X.1.14) 
23d:19h:5m:3s ( sip_stack)(4052 ) SIPDialog(#16) changes state from DialogConnected to DialogDisconnected 
23d:19h:5m:3s ( sip_stack)(4053 ) AcSIPStackAPI::FreeDialogAPI - #16 
23d:19h:5m:3s ( sip_stack)(4054 ) UdpRtxMngr::Remove 1 OPTIONS 
23d:19h:5m:3s ( sip_stack)(4055 ) Resource SIPMessage deleted - #0 
23d:19h:5m:3s ( lgr_flow)(4056 ) | | TransactionUserMngr::ReturnDialog - #16 
23d:19h:5m:3s ( sip_stack)(4057 ) SIPDialog(#16) changes state from DialogDisconnected to DialogIdle

It looks like the call is making it to the controller and then the controller (X.X.1.1) is sending a DIALOG_DISCONNECT_REQUEST, but I'm not sure why.

Thanks

 

[LoopyLou]

Would you be able to test with a traditional analog port just to eliminate the elevator box as a problem? Have seen some elevator systems do strange things.

I'd tell you a UDP joke but I'm afraid you won't get it. TCP jokes are the best because you always get them.

 

[dbutler17]

I was just about to update this, the line seems fine with an analog set.

The model is a Rath microtech smartphone 2. On their web-page this is listed as a common issue, so I emailed their tech support to see if they had any suggestions. I'll post what I find out.

I have a handful of others that aren't working correctly, all with different symptoms, so I'll put those up as well when I figure them out.

Thanks