Switch can't process more than 30K ports

Introduction

By default, Class 4 softswitch cap the max inbound session to 30K to avoid servers without sufficient memory to run out of memory. This is useful when someone runs the Class 4 softswitch using less memory.

If you are seeing the following error in the {dnlsoftswitch_dir}/log/dnl_softswitch.log, that means the switch's internal max_inbound_session is exceeded:

2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call
2021-04-19 17:30:19  [WARNING] sip_sessions.c:787 Maximum inbound call in progress, can't accept a new incoming call

If you have sufficient memory, you can increase this value in dnl_softswitch.conf.

[general]
Default Global Log Level - value is one of debug(7),info(6),notice(5),warning(4),err(3),crit(2),alert(1),emergency(0)
log_level = 5
#System sip channel limit
max_inbound_session = 30000 
max_outbound_session = 60000
#Default switch server process thread count
task_counts = 20  

After you change this config file, you must remember to restart dnl_softswitch using systemctl:

systemctl restart dnl_softswitch    

The path for this config file is :

 {installpath}/denovo/dnl_softswitch/conf/cnl_softswitch.conf