Interoperability: Snom about asterisk-opus HOT 2 OPEN

Snom fixed that issue just days after my report: 8.9.3.59…

However, I cannot close this issue yet, because opus-nb still gives no-audio, when there are additional format parameters within the SDP-INVITE, for example Asterisk is configured to use not variable bit-rate but constant bit-rate: a=fmtp:119 maxplaybackrate=8000; cbr=1.

This does not happen, when you use opus-wb. If you face any additional issues with opus-wb, do not hesitate add your comment to this thread. For me, opus-wb works fine.

from asterisk-opus.

Snom uses opus-wb to send wideband audio (16000 kHz) and opus-nb to send narrowband audio (8000 kHz).

I have to correct myself because those are not about sending but just asking the remote party what to send.
When you specify opus-wb, the Snom adds the following format parameters to SDP:

a=fmtp:119 maxplaybackrate=16000;sprop-maxcapturerate=16000;maxaveragebitrate=20000;useinbandfec=1

When you specify opus-nb, the Snom adds the following format parameters to SDP:

a=fmtp:118 maxplaybackrate=8000;sprop-maxcapturerate=8000;maxaveragebitrate=12000;useinbandfec=1

When you specify just opus, no format parameters are added to SDP, allowing the remote party to send anything. In all cases, the Snom itself sends just Opus-NB (SiLK-only Narrowband 20ms; ToC 0x08). I found no way via Phone, Web, or Provisioning interface nor SDP fmtp, to trigger higher bands like Opus-WB. This was reported …

from asterisk-opus.