I have a problem with Zoiper client and Unify OpenScape 4000 Pabx.
When Client Zoiper is put on hold from a pabx subscriber , Pabx send a (re)invite messagge with SDP information media attribute "sendonly".
Zoiper client response is 200 OK with attribute "media inactive" and the music hold is not hear on the client (while the display shows call on hold).
Any suggestion to solve this issue? ( I can not modify the sendonly SDP mechanism)
Is it possible at least to reproduce a local music on hold on the client Zoiper?
Thank you in advance