Summary:	ASTERISK-28179: Asterisk responses 100 trying about 4 seconds after sending INVITE.
Reporter:	Cao Minh Hiep (hiepcm)	Labels:
Date Opened:	2018-11-22 05:52:03.000-0600	Date Closed:	2018-11-22 07:21:16.000-0600
Priority:	Major	Regression?
Status:	Closed/Complete	Components:	Channels/chan_sip/General
Versions:	13.12.0	Frequency of Occurrence	Occasional
Related Issues:
Environment:		Attachments:
Description:	Hello, We found a bug at the Asterisk v 13.12.0. as the following: Make a call from a phone A to phone B. But when phone A sends INVITE to asterisk. Asterisk sends back 100 trying to phone A after about 4s. We don't know what made the delay response. We are using a primary server and a secondary server. When the delay response happened, it turns from primary to secondary. We know that you only support us if it happens at the newest version. But have you seen this issue like that before?. Please show us if you have any solutions (patch) to solve this problem?. Thank you.
Comments:	By: Asterisk Team (asteriskteam) 2018-11-22 05:52:04.338-0600 Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution. A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report. Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process]. By: Joshua C. Colp (jcolp) 2018-11-22 07:21:16.593-0600 This problem can happen if network problems occur and DNS resolution is delayed or fails. This is a known fundamental problem in chan_sip itself. There are no patches to change this. To confirm this you'd need to do further investigation yourself and look at how DNS is used within your environment. In the future I would also advise using the community resources[1] before opening an issue unless you know it is absolutely a bug. You also have the same access as others and can search JIRA for similar problems. [1] https://community.asterisk.org/ By: Cao Minh Hiep (hiepcm) 2018-11-25 19:21:45.811-0600 Thanks for your explanation. It's really helpful for us. Also, thanks for your advise on using community resources. I'll do it next time. By: Asterisk Team (asteriskteam) 2018-11-25 19:21:46.142-0600 This issue has been reopened as a result of your commenting on it as the reporter. It will be triaged once again as applicable.