Thanks Brian,

RAM is upgraded to 16 gigs now

this is the output of 'status'
status
UP 0 years, 0 days, 1 hour, 25 minutes, 47 seconds, 805 milliseconds, 279 microseconds
FreeSWITCH (Version 1.6.11  64bit) is ready
251 session(s) since startup
0 session(s) - peak 7, last 5min 0
0 session(s) per Sec out of max 300, peak 7, last 5min 0
1000 session(s) max
min idle cpu 0.00/95.80
Current Stack Size/Max 240K/8192K

this sip log is with only INVITE request and nothing back from freeswitch
http://pastebin.com/41AtUAje

this sip log is with INVITE and response of 503 from freeswitch
http://pastebin.com/PXz277XD

this is the from
sofia loglevel all 9
http://pastebin.com/fBPhfkns

On Thu, Oct 27, 2016 at 7:32 PM, Brian West <brian@freeswitch.org> wrote:

sofia global siptrace on 

Look at the logs and signaling its usually informative, You can also do sofia loglevel all 9 to really get more details.

On Thu, Oct 27, 2016 at 7:38 AM, devang nathwani <devang.nathwani31589@gmail.com> wrote:

Thanks Michael,
[INFO] mod_dptools.c:3401 Originate Failed.  Cause: NORMAL_TEMPORARY_FAILURE

This is what freeswitch thinks when i got 503 service unavailable in sip log

On Thu, Oct 27, 2016 at 5:57 PM, Michael Jerris <mike@jerris.com> wrote:

Have you looked at a debug log when this is happening to see what FreeSWITCH thinks is going on?

On Oct 27, 2016, at 7:14 AM, devang nathwani <devang.nathwani31589@gmail.com> wrote:

Hello,

Freeswitch version: 1.6.11

Number of registration on my switch: 270+

Ram: 4 GB, 1 GB is free; 64 bit debian 8

I am facing this issue, where some time i am getting continuous INVITE registration requests but freeswitch not responding to it

and sometime i am getting 503 service unavailable

I have gone though https://freeswitch.org/jira/si/jira.issueviews:issue-html/FS-6589/FS-6589.html as well but not finding much helpful.

here is the sip log for the same, if you want to go through.
http://pastebin.com/PXz277XD

Is RAM upgrade a solution? or any other?

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