Hello Matthew,
welcome to the Polycom Community.
The community's PSTN FAQ contains this post here:
Oct 20, 2011 Question: How can I setup a conference or how many participants can be in the conference?
Resolution: Please check => here <=
The above explanation is also applicable in transferring a call as the same technology is being used.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services
----------------
If official support is required please check how to phone or open a case here
----------------
The title Poly 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. All posts and words are my own & do not represent the views of Employer.
----------------
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
