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Pau Espin Pedrol pespin at sysmocom.deHi, Indeed PCU is in charge of handling PDCH timeslots which are related to GPRS. "pcu_bts" is not a regular file, is a unix domain socket which is used to interconnect osmo-bts-trx and osmo-pcu. So having failures there means you either have a configuration problem (path incorrect configured) or a permission/ownership problem, maybe because you run osmo-bts-trx or osmo-pcu with root and the other with regular user, so the unix domain socket is created with permissions which the other process cannot then use. So, assuming you don't have issues BTS<->PCU issues and everything's fine, seeing "PCU socket not connected, dropping message" could mean PCU crashed at that time and is no longer available. When you start a phone call there may be PCU related traffic because the MS was probably doing data transfers in PDCH timeslots until the exact moment when you page the MS and ask it to go for a call, so the MS needs to "suspend" the GPRS use and notifies the network. -- - 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