Sometime when you start running Asterisk you may get the below error, which causes delay in call connection etc.
> 0x104be738 -- Strict RTP learning after remote address set to: 192.168.1.103:14446
-- Executing [1002@PA:1] Dial("SIP/1001-00000000", "SIP/1002,20") in new stack
[Sep 2 10:32:37] WARNING[772][C-00000000]: app_dial.c:2527 dial_exec_full: Unable to create channel of type 'SIP' (cause 20 - Subscriber absent)
== Everyone is busy/congested at this time (1:0/0/1)
-- Auto fallthrough, channel 'SIP/1001-00000000' status is 'CHANUNAVAIL'
-- Executing [h@PA:1] Set("SIP/1001-00000000", "CDR(userfield)= Quality: R/W:alaw/alaw N:(alaw) Priority : 1") in new stack
-- Registered SIP '1002' at 192.168.1.102:15998
> Saved useragent "MizuDroid/3.1.0" for peer 1002
[Sep 2 10:32:49] NOTICE[747]: chan_sip.c:24646 handle_response_peerpoke: Peer '1002' is now Reachable. (6ms / 2000ms)
-- Registered SIP '1001' at 192.168.1.103:14448
[Sep 2 10:32:54] ERROR[747][C-00000001]: netsock2.c:305 ast_sockaddr_resolve: getaddrinfo("raspbx", "(null)", ...): Temporary failure in name resolution
[Sep 2 10:32:54] WARNING[747][C-00000001]: acl.c:835 resolve_first: Unable to lookup 'raspbx'
[Sep 2 10:32:59] ERROR[747][C-00000001]: netsock2.c:305 ast_sockaddr_resolve: getaddrinfo("A.ROOT-SERVERS.NET", "(null)", ...): Temporary failure in name resolution
[Sep 2 10:32:59] WARNING[747][C-00000001]: acl.c:835 resolve_first: Unable to lookup 'A.ROOT-SERVERS.NET'
== Using SIP RTP CoS mark 5
> 0x104c2a48 -- Strict RTP learning after remote address set to: 192.168.1.103:14450
-- Executing [1002@PA:1] Dial("SIP/1001-00000001", "SIP/1002,20") in new stack
[Sep 2 10:33:04] ERROR[774][C-00000001]: netsock2.c:305 ast_sockaddr_resolve: getaddrinfo("raspbx", "(null)", ...): Temporary failure in name resolution
[Sep 2 10:33:04] WARNING[774][C-00000001]: acl.c:835 resolve_first: Unable to lookup 'raspbx'
[Sep 2 10:33:09] ERROR[774][C-00000001]: netsock2.c:305 ast_sockaddr_resolve: getaddrinfo("A.ROOT-SERVERS.NET", "(null)", ...): Temporary failure in name resolution
[Sep 2 10:33:09] WARNING[774][C-00000001]: acl.c:835 resolve_first: Unable to lookup 'A.ROOT-SERVERS.NET'
The issue is because it is unable to resolve the name, the fix is edit /etc/hosts file
vim /etc/hosts
so default /etc/hosts file content may look like this
127.0.0.1 localhost.localdomain localhost
Add one more line
127.0.0.1 localhost.localdomain raspbx
The raspbx can be changed with whatever mentioned in the error acl.c:835 resolve_first: Unable to lookup ‘raspbx’
HalfaGeek 