Good Morning: I am setting up some IP 335 phones and have run into a small issue. When I attempt to dial from an NEC workstation, the call rings thru to the Polycom but the Polycom does not transmit a ring back tone to the NEC workstation, just silence.
Does anyone know the following:
Why this would happen?
What setting controls the ring back feature in the setup?
Any help would be greatly appreciated.
welcome to the Polycom Community.
Usually SIP Endpoint like phones can provide their own Call State / Call Progress tones.
Lifting up the Handset on a Polycom Phone will provide a dial tone even if the phone would not be registered.
Calling another phone will provide a call progress tone.
If you do not receive a call progress tone when calling a Polycom Phone then you should investigate on the NEC Side as the Polycom phone like other SIP Endpoints would only signal back that they are accepting the call.
Above is just a basic example.
Please liaise with your NEC / SIP Provider.
Polycom Global Services
Hello, Thank you for your response. I did some checking and I am still unable to find out where the breakdown is occurring. Let me try to explain:
NEC --> SIP Soft Switch
SIP Soft Switch --> PolyCom
The Polycom is registered with the SIP soft switch on static port 5060. The call does complete when dialing from an NEC to a PolyCom but the call progress tone NEVER makes it back to the NEC.
In you opinion, is the call progress tone being stopped or misdirected by the SIP soft switch or the PolyCom phone itself?
Please Advise and Thank you!
as far as I am aware the Polycom Phone would not provide the actual "tone".
The Polycom Phone will receive an SIP Invite from the SIP Server based on the NEC Workstation calling it.
The Phone will then send a SIP 200 OK back to the SIP Server
The Phone will then send a SIP 100 Trying to the Server
The Phone will then send a SIP 180 Ringing to the Server (as it now audibly signals the incoming Call on the Polycom Phone that has been called)
The Phone will then send a SIP/SDP 200 OK back to the Server when the call is answered on the Polycom Phone.
At no time will the Phone physically send a Call Progress Tone back to your calling End Point (NEC Workstation)
Please raise this with your SIP Server Provider as this is in my understanding working as designed.
The Polycom Phone on the other hand is able to produce it's own call Progress tones for an outgoing call and is described in this FAQ Post => here <=
Polycom Global Services
Thanks again for the information. I did a wireshark transfer and noticed that I did not have a route built into my trunks and gateways for the extensions that were being called. So when the call attempt to send out a call progress tone, it could not find the owner/originator of the call.
I am all set and working now.