Asterisk fork itself during it running in the continues being called

[chendong199122]

When I using the asterisk in the sip module and I use eight line to call contiune, I meet a issue the asterisk will fork one or more processes by the initial process. However, I delete all the fork and execl/execv the issue still exist. The following is the log:
Password:

ps | grep asterisk

10689 telecoma 8516 S /usr/sbin/asterisk
13077 telecoma 660 S grep asterisk
25629 telecoma 2864 R /usr/sbin/asterisk
25633 telecoma 2864 R /usr/sbin/asterisk

cat /proc/25629/status

Name: asterisk
State: R (running)
Tgid: 25629
Ngid: 0
Pid: 25629
PPid: 10689
TracerPid: 0
Uid: 0 0 0 0
Gid: 0 0 0 0
FDSize: 256
Groups:
VmPeak: 52188 kB
VmSize: 52188 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 2864 kB
VmRSS: 2864 kB
VmData: 42664 kB
VmStk: 136 kB
VmExe: 1592 kB
VmLib: 5196 kB
VmPTE: 48 kB
VmSwap: 0 kB
Threads: 1
SigQ: 0/1671
SigPnd: 00000000000000000000000000000000
ShdPnd: 00000000000000000000000000000000
SigBlk: 00000000000000000000000000085003
SigIgn: 00000000000000000000000000001004
SigCgt: 000000000000000000000001c013e003
CapInh: 0000000000000000
CapPrm: 0000003fffffffff
CapEff: 0000003fffffffff
CapBnd: 0000003fffffffff
Cpus_allowed: 2
Cpus_allowed_list: 1
Mems_allowed: 1
Mems_allowed_list: 0
voluntary_ctxt_switches: 0
nonvoluntary_ctxt_switches: 3853227

From the log ,you will look at the pid 25629 the ppid is the 10689。
So I want to kown asterisk how to fork itself and why?
Thanks

[david551]

Why does it matter?

Which modules are you using?

What does a backtrace indicate that the process is running?

[chendong199122]

In the situation, the phone cann’t call contiunely and may cause the relevant drivers working normally.
The modules which I use like the following:
tc*CLI> module show
Module Description Use Count
func_strings.so String handling dialplan functions 0
res_smdi.so Simplified Message Desk Interface (SMDI) 0
app_db.so Database Access Functions 0
app_dial.so Dialing Application 0
app_exec.so Executes dialplan applications 0
app_macro.so Extension Macros 0
app_meetme.so MeetMe conference bridge 0
app_read.so Read Variable Application 0
app_softhangup.so Hangs up the requested channel 0
app_stack.so Dialplan subroutines (Gosub, Return, etc 0
app_system.so Generic System() application 0
app_transfer.so Transfers a caller to another extension 0
cdr_sqlite3_custom.so SQLite3 Custom CDR Module 0
chan_agent.so Agent Proxy Channel 0
chan_dahdi.so DAHDI Telephony 0
chan_ims.so IP Multimedia Subsystem (IMS) 0
chan_local.so Local Proxy Channel (Note: used internal 0
chan_sip.so Session Initiation Protocol (SIP) 0
codec_alaw.so A-law Coder/Decoder 0
codec_g722.so ITU G.722-64kbps G722 Transcoder 0
codec_ulaw.so mu-Law Coder/Decoder 0
func_callerid.so Caller ID related dialplan functions 0
func_cdr.so Call Detail Record (CDR) dialplan functi 0
func_check.so Check Application 0
func_db.so Database (astdb) related dialplan functi 0
func_global.so Variable dialplan functions 0
func_iconv.so Charset conversions 0
func_logic.so Logical dialplan functions 0
func_module.so Checks if Asterisk module is loaded in m 0
func_uri.so URI encode/decode dialplan functions 0
pbx_config.so Text Extension Configuration 0
31 modules loaded

[chendong199122]

You can see this:
10689 telecoma 8516 S /usr/sbin/asterisk
13077 telecoma 660 S grep asterisk
25629 telecoma 2864 R /usr/sbin/asterisk
25633 telecoma 2864 R /usr/sbin/asterisk
From the log ,we can see the father process is int the sleep satstus, and the two children processes are in the running status.

[chendong199122]

I also change the main.c when the asterisk has been running ,another asterisk process cann’t been running the same time. And I delete the all for,system,clone and the family of exec functions,but the system also has the same issue.