[asterisk-bugs] [JIRA] (ASTERISK-25469) chan_sip enabled unnegotiated session-timers after reinvite if minse is non-default.

[Walter Doekes (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-25469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Walter Doekes updated ASTERISK-25469:
-------------------------------------

    Attachment: iinv-o200-oinv-i200-oinv-i200-wait-obye.xml

> chan_sip enabled unnegotiated session-timers after reinvite if minse is non-default.
> ------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-25469
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25469
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/Interoperability
>    Affects Versions: 11.20.0
>            Reporter: Walter Doekes
>         Attachments: iinv-o200-oinv-i200-oinv-i200-wait-obye.xml
>
>
> If I give Alice these two sip.conf settings:
> {noformat}
> session-minse=91
> session-expires=92
> {noformat}
> If Alice then gets called, and Alice initiates one or more reINVITEs, Asterisk enables session timers. In the 200 to the reINVITEs, Asterisk will add this:
> {noformat}
> Session-Expires: 92;refresher=uac
> {noformat}
> and then it expects reinvites from Alice.
> It seems plausible that the cause should be found here:
> {code}
>         /* Add Session-Timers related headers */
>         if (st_get_mode(p, 0) == SESSION_TIMER_MODE_ORIGINATE
>                 || (st_get_mode(p, 0) == SESSION_TIMER_MODE_ACCEPT
>                         && st_get_se(p, FALSE) != DEFAULT_MIN_SE)) {
>                 char i2astr[10];
>                 if (!p->stimer->st_interval) {
>                         p->stimer->st_interval = st_get_se(p, TRUE);
>                 }
>                 p->stimer->st_active = TRUE;
>                 if (st_get_mode(p, 0) == SESSION_TIMER_MODE_ORIGINATE) {
>                         snprintf(i2astr, sizeof(i2astr), "%d", p->stimer->st_interval);
>                         add_header(&req, "Session-Expires", i2astr);
>                 }
>                 snprintf(i2astr, sizeof(i2astr), "%d", st_get_se(p, FALSE));
>                 add_header(&req, "Min-SE", i2astr);
>         }
> {code}
> Default mode is SESSION_TIMER_MODE_ACCEPT and the get_mins_se is non-standard, so Asterisk enables session timers.
> When the reINVITE is seen, we get here:
> {noformat}
>         /* If this is an invite, add Session-Timers related headers if the feature is active for this session */
>         if (p->method == SIP_INVITE && p->stimer && p->stimer->st_active == TRUE) {
>                 char se_hdr[256];
>                 snprintf(se_hdr, sizeof(se_hdr), "%d;refresher=%s", p->stimer->st_interval,
>                         p->stimer->st_ref == SESSION_TIMER_REFRESHER_US ? "uas" : "uac");
>                 add_header(resp, "Session-Expires", se_hdr);
> ...
> {noformat}
> The headers get added, and somewhere along the road, the timers get activated too.
> See attached SIPp scenario that trips on the bug.



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