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Custom chord-set only works with Music-On-Hold set

Occasional Advisor

Custom chord-set only works with Music-On-Hold set

Hi, everyone.


I found this strange behavior from my Polycom phones lately.

I have configured the following chord-set for ring-back tone.



It worked fine with "voIpProt.SIP.musicOnHold.uri" configured.

I removed MOH setting and made a call to the phone.

Then I could not hear any call progress tone although the phone was ringing.

And the progress tone got back when I restored MOH.


This was observed in SPIP 335 with USC 4.0.1B and SPIP 650 with USC 4.0.3F phones.


Any idea to resolve it will be appreciated.


Best regards,

Message 1 of 3
Polycom Employee & Community Manager

Re: Custom chord-set only works with Music-On-Hold set

Hello Wonbon,


that parameter has absolutely nothing to do with call progress.


From the UCS 4.0.1 Admin Guide page 538:


A URI that provides the media stream to play for the remote party on hold. This parameter is used if reg.x.musicOnHold.uri is Null.


There is an issue with the tones at present since UCS 3.3.2 (from memory) up until the current UCS 4.x.x if the sound starts with a tone instead of a break.


Have a look at this search results => here <= and work with your Polycom reseller if further support is needed.


Best Regards


Steffen Baier

The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.


Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
Message 2 of 3
Occasional Advisor

Re: Custom chord-set only works with Music-On-Hold set

Hi, Steffen.

Thanks for the info and I'll look into it.


I know it is strange but really I could turn progressing tone on and off as I set MOH uri.



Best regards,

Message 3 of 3