This is still in process, the tech I am dealing with said:
I want to be sure I'm understanding the problem (sidetone) you have with your SPA504 phones.
When you blow into the mouthpiece of a 504 handset, you expect to hear the sound of wind or static or some kind of feedback that indicates the phone detected the blowing air and converted it into a sound similar to wind blowing or sort of a static sound. Is this close to what you're looking for?
I tested several (8 or 9) SPA502, SPA504, SPA508, and SPA509 phones in our lab. Most of these phones were registered with UC540 IP PBX's using SPCP. I also connected one phone to an SPA9000 to test using SIP instead of SPCP. In all cases, the phones produced a blowing sound when I blew into the mouthpiece, so it seems the phones in our lab are providing this sidetone.
If I'm testing the wrong thing, or this blowing sound is not what you're looking for, please let me know.
When you blow into the mouthpiece, do you not hear anything at all in the earpiece?
I just got a 525g in last week after I received this email and:
1.) registered phone with pbx to enable "dial tone" (can also set phone to dial without registration to test)
2.) picked up handset and pressed first line key
3.) blow or tap mouthpiece to check for sidetone.
It is completely dead on the earpiece side when I do this.
Just updated to spa525g-7.4.3 firmware, and now the 525 has sidetone! No luck with the 504s yet, but this is promising at least.
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