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Hello.

My new D385 desktop phone, connected to a MyPBX, is unable to place outbound calls, while it receives inbound calls without problems.

The error I get is 488 "Not Acceptable here".

I found in this community the following article: 
https://service.snom.com/display/FORUM/%5BD785%5DNot+Acceptable+Here

I turned off the RTP encryption as suggested by the above article, but now I get a 404 "Not found" error.

I attach the log files for both failures.

Can somebody provide me with some insight/help, please?

snom-d385-notacceptable.txt
snom-d385-notfound.txt



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Luke Orso

End user

Joined: 16.10.2025

1 Comment

  1. Snom Gianmaria Tononi

    Hi,

    The 488 "Not Acceptable here" error usually comes back when something isn't aligned between the phone and the PBX: it may be SRTP (which doesn't seem to be your case) or codecs for example, or something related to the ciphers used for encryption

    It's hard to tell on the phone's side, a SIP trace would be the place to start debugging this, observing both an incoming call (which is working, with codecs and cipher set by the PBX) and outgoing calls to try and understand what differs

    But generally we recommend looking into the PBX for these kind of issues, if the phone just gets the 488 error back it cannot understand what it needs to change to adapt, the PBX should be able to clarify this

    Also please remember we don't debug topics using our public Community, advanced support is only available for Snom partners

    If you are one, you can raise a private ticket so we can look into this, otherwise we recommend bringing this back to the reseller that installed the phones (likely a Snom partner), or talking with our sales team so they can direct you to a local Snom partner that may be able to help https://www.snom.com/en/contact/contact-person/

    Thank you