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Pau Espin Pedrol pespin at sysmocom.deHi, 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. -- - Pau Espin Pedrol <pespin at sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Director: Harald Welte