What Call-ID when we run Sofia status profile xxxxxx reg?

Question

I am trying to make an iOS app with PJSIP, I am using GOSSIP wrapper for that when i run the following command

"Sofia status profile xxxxxx reg"

to check the registered devices on server, i get following for each device. I was wondering about what is Call-ID parameter and if i can get this on device? if Yes then how?

Call-ID: mDWB.zJEvhcLSOnZcKTuTFbrduzO--0a
User: xxxxxxxxxxxxxxxxx
Contact: ""
Agent: Dringgg-Android
Status: Registered(UDP)(unknown) EXP(2016-02-23 16:11:23) EXPSECS(95)
Ping-Status: Reachable Ping-Time: 0.00 Host: srv1 IP: xxxxxxxxxxxxx Port: 8080 Auth-User:
xxxxxxx Auth-Realm: xxxxxxxxx MWI-Account: xxxxxxxxxxxxxxxxx

Answer 1

Call-ID header field (mandatory) is a dialog identifier and it's purpose is to identify messages belonging to the same call/dialog. Such messages have the same Call-ID identifier.

I'm not sure if you can get it when registering a user agent but it can be obtained when making a call using pjsua_call_make_call function, from the last parameter p_call_id

pj_status_t pjsua_call_make_call (pjsua_acc_id  acc_id,
                                  const pj_str_t *  dst_uri,
                                  const pjsua_call_setting *    opt,
                                  void *    user_data,
                                  const pjsua_msg_data *    msg_data,
                                  pjsua_call_id *   p_call_id 
)   

Answer 2

it can also be retrieved on callback method like : on_call_state

here you get a struct pjsua_call_info.

in which ci.call_id can be found.