Certain providers are picky about what they see.
When polycom phones send a call out, they include metadata and messages in the SIP header.
Question: Can I modify these in any way such as by configuration file or menu?
welcome to the Polycom Community.
As you have not provided any kind of useful information nobody will be able to advise you.
Usually we would expect at least the currently used software version and then in addition the part of the SIP messaging that your SIP provider seems to be violating the RFC.
I suggest you work with your Polycom reseller to bring this to the attention of Polycom support.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services
I believe my above light hearted response may have not been that satisfactory.
We, Polycom, do attempt to follow the RFC as closely as we possibly can.
If somebody provides a rather broad statement, as in your case, we do simply require a certain amount of basic information in order to:
Your current statement / post does simply not include enough basic information to look at this.
Usually we would expect at least:
Please update this post any any other posts with at least some minimal update or as advised work directly with our support team as uncountable partners have simply not raised a similar query.