SNOM D335 with firmware 10.1.141.13 connected at our own communications systems. In G723, the SIP call is established, ,but nothing is sent by the D335 and RTP coded in G723 received by network to the D335 is not listened.

With default settings or with these special settings : rtp_codec_type = g723 / rtp_codec_size = 30 or 60 / codec_priority_list = g723,g722,pcmu,pcma,gsm,g726-32,aal2-g726-32,g729,telephone-event.

I don't have problem with SNOM300 or SNOM D305 with same settings.