Does anyone have an experience with T.38 Interoperability with Verizon? I have eight different telephone numbers in different area codes \ prefixes. Some re-invite T.38 and other re-invite G.711 only. I've done multiple tests on these numbers with consistent results. Bad numbers: 412-469-02XX 412-469-40XX 615-850-XXXX 858-693-XXXX Good numbers: 503-205-02XX 858-695-XXXX 502-205-01XX I have a trouble ticket open with Verizon. I can tell from the SIP signaling that they are using Sonus but it isn't clear whether their configuration and support for T.38 is uniform across their platform. Is Verizon's support for T.38 usually consistent? I have a Ditech PVP that I can use for transcoding. Should I just assume that I'll need to transcode some of the time? My Fax Server is T.38 only and will rejects calls with "488 Not acceptable here". My Ditech PVP is end of life so if transcoding is a requirement I may be looking for a new transcoding solution. This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system.