Re: Can't establish calls between two handsets [nanoBTS 165AU]

Hi,

On 7/30/21 4:49 PM, Sebastian Mauer wrote:

lchan(0-0-2-TCH_F-0)[0xaaaadc432ba0]{WAIT_RLL_RTP_ESTABLISH}: (type=TCH_F) lchan-rtp failure in state WAIT_IPACC_CRCX_ACK: Received NACK on IPACC CRCX

You received a IPACC CRCX NACK from nanoBTS as an answer to IPACC_CRCX (that's sent osmoBSc->nanoBTS to configure the RTP stream on the nanoBTS side). So it seems the nanoBTS is not liking the configuration you are requesting to it? Providing a pcap file containing Abis RSL would help understand better by looking at what the IPACC CRCX contains. I'd bet you are passing a loopback address to it or something similar, probably due to wrong osmo-mgw configuration.