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[Linphone-developers] Linphonecsh missing SIP ACK[nophi]

From: Ham, Ted
Subject: [Linphone-developers] Linphonecsh missing SIP ACK[nophi]
Date: Tue, 29 May 2018 02:34:18 +0000

Hello. I am using the latest version of Linphonecsh on my Ubuntu. I have a PHP script dial the linphone using the linphonecsh dial command. Linphonecsh dials an extension phone on my Cisco Call Manager Express, The Cisco phone rings and call is connected, it works. All of this is on the same subnet in my lab, no firewalls, just 5 feet of CAT-5 cable between Linux server and Cisco CME. When Linphone calls Cisco phone, the Cisco router keeps sending SIP 200 ok’s to Linphone but Linphone never sends ACK to those 200 ok’s, so Cisco initiates a BYE to Linphone and hangs up. The call only lasts 9 seconds. I can max out my SIP timers on Cisco router to make call last 38 seconds but I need that call to stay up longer. There is no voice on this call. I just need this linphone call to the Cisco phone nailed up for like 2 minutes.  Why does Linphone not ever send ACK to the Cisco 200 ok’s?





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