Hello, we have the following scenario: A PSTN call (A) is coming in to Freeswitch through a Patton gateway. For the called FS user, call forwarding has been enabled to another PSTN extension (B) . Result: The calling party does not hear any ringing tone. Here an Abstract of the SIP protocol we traced (PSTN(A) and PSTN(B) is in fact the same Patton Gateway): PSTN(A)====INVITE===>FS PSTN(A)<===TRYING===>FS FS===INVITE==>PSTN(B) FS<==TRYING===PSTN(B) FS<==RINGING==PSTN(B) PSTN(A)<==PROGRESS===FS FS<===OK======PSTN(B) FS====ACK====>PSTN(B) PSTN(A)<===OK========FS PSTN(A)====ACK======>FS I would expect that FS answers RINGING back to PSTN(A). Instead it only answers SESSION PROGRESS. When PSTN(B) answers, they can hear each other, but there was no ringing tone to PSTN(A) before. Are there any hints to overcome this, besides playing early media to PSTN(A)? Best regards Peter