Hello Guix! I just realized that we do not have any working SIP client. We do have twinkle and jami. Twinkle is not under development since 2009. Jami is buggy, but in active development (upstream). So after a brief research, I found out that Linphone and Ekiga are good candidates. With regards to Linphone, roptat has done some preliminary work. https://framagit.org/tyreunom/guix-more/blob/master/more/packages/messaging.scm Anybody intrested in packaging Linphone and/or Ekiga? Linphone: https://www.linphone.org Ekiga: https://www.ekiga.org Thank you! Regards, RG.