We seem to have an ongoing issue when making calls between 7905 and 7920/21 phones. Often you get one-way audio or no audio at all. Its specific to calls between these model types, calls to/from other phone models or the PSTN are fine. This is across multiple sites, some using AP's and others using 877W's.
We are using the latest software for the 7905 (8.0.3), the 7920 (4.0-03-02) and the 7921 (1.1.01).
Has anyone experienced this issue?