SIP registration


#1

Hi there,
over the last week or so ive started to get issues with sip registration. Some of the phones disconnect and then reconnect after a second, this happens every 5-20mins. can anyone point me in the right direction?

2018-11-14 21:11:30
SIP Lost Registration
Restore to normal
SIP registration recovered for extension: PJSIP/810, Username: PJSIP/810
2018-11-14 21:11:29
SIP Lost Registration
Generate Alert
SIP lost registration event! Extension: PJSIP/810, Username: PJSIP/810
2018-11-14 21:01:51
SIP Lost Registration
Restore to normal
SIP registration recovered for extension: PJSIP/807, Username: PJSIP/807
2018-11-14 21:01:49
SIP Lost Registration
Generate Alert
SIP lost registration event! Extension: PJSIP/807, Username: PJSIP/807
2018-11-14 20:43:38
SIP Lost Registration
Restore to normal
SIP registration recovered for extension: PJSIP/818, Username: PJSIP/818
2018-11-14 20:43:35
SIP Lost Registration
Generate Alert
SIP lost registration event! Extension: PJSIP/818, Username: PJSIP/818
2018-11-14 20:40:57
SIP Lost Registration
Restore to normal
SIP registration recovered for extension: PJSIP/848, Username: PJSIP/848
2018-11-14 20:40:54
SIP Lost Registration
Generate Alert
SIP lost registration event! Extension: PJSIP/848, Username: PJSIP/848
2018-11-14 20:33:03
SIP Lost Registration
Restore to normal
SIP registration recovered for extension: PJSIP/852, Username: PJSIP/852
2018-11-14 20:33:00
SIP Lost Registration
Generate Alert
SIP lost registration event! Extension: PJSIP/852, Username: PJSIP/852


#2

You indicated that over the last week or so…implying that the system has been installed for some time and this issue only cropped up recently. Is this the case or did you turn on the notice and perhaps its been happening all along. How long has the installation been completed or in use?

The first set of questions are:

  1. What firmware version on the UCM?
  2. What make and model of phone and firmware versions?
  3. Are all the phones connected to the same LAN segment as the UCM? Are some remote and if so, which ones?
  4. Has anything at all changed?
    a) new firmware?
    b) new router, switch?
    c) new configs?
  5. When the phones are working, are there any call quality issues?
  6. Is it all phones or just some? If only some and the same ones each time, what is common about their connection?
  7. When you look at the extensions in the UCM, and when registered, are they showing their private IPs or a public?
  8. For those extensions that are connected to the same LAN as the UCM, is the NAT box checked or unchecked in the extension setting in the UCM?
  9. In the PBX settings, SIP settings, NAT, have you added the local LAN segment at the bottom of the page?
    9 Have you attempted to power cycle the switches and router?
  10. Have you done a network capture to see what the communications between the UCM and phones is or is not doing.
  11. You might try turning on keep-alives in the extensions and see if this helps. Normally this should not be needed or done as its intent is to cause firewalls to keep the needed ports open but, 1) I am of the impression that the phones are local to the UCM and only switches stand in the path and, 2) switches do not normally concern themselves with port traffic. Additionally, it creates extraneous network traffic and it does nothing to accelerate a Register. In a well working network, this is never needed and I do not encourage its use.

Sorry, but you have only reported a symptom for which there can be a number of various causes and as a result, we have to drill down to get more history in order to get a better understanding of all that might be a cause.

If the phones and UCM are not running the latest or one of the latter versions of firmware, please update all and then monitor the situation. Firmware updates oftentimes fix (and break) things, but the bottom-line is that there is no point in working on devices whose firmware is so out-of-date, that none of us have a feel for it any longer nor will GS support should it come down to their involvement.


#3

I had rebooted everything except the switch, but that did the trick.

I had changed the IP pool on the dhcp server and the switch mustve kept the old settings in the memory or something

thanks again for your very helpful post