Error 1.8

Hello,

Does any one knows solution of this error,

[Jul 18 21:10:34] ERROR[17878]: netsock2.c:245 ast_sockaddr_resolve: getaddrinfo(“191745xxxxx”, “(null)”, …): Name or service not known
[Jul 18 21:10:34] WARNING[17878]: chan_sip.c:5223 create_addr: No such host: 191745xxxxx
[Jul 18 21:10:34] WARNING[17878]: acl.c:708 ast_ouraddrfor: Cannot connect
[Jul 18 21:10:34] WARNING[17878]: chan_sip.c:3280 __sip_xmit: sip_xmit of 0x2aaad027c330 (len 881) to (null) returned -1: Invalid argument
– Called 191745xxxxx
– Local/64622xxxxx@main-5aad;2 requested special control 20, passing it to SIP/191745xxxxx-00000a9f
[Jul 18 21:10:34] WARNING[3543]: chan_sip.c:3280 __sip_xmit: sip_xmit of 0x2aaad027c330 (len 881) to (null) returned -1: Invalid argument
[Jul 18 21:10:35] WARNING[3543]: chan_sip.c:3280 __sip_xmit: sip_xmit of 0x2aaad027c330 (len 881) to (null) returned -1: Invalid argument
[Jul 18 21:10:37] WARNING[3543]: chan_sip.c:3280 __sip_xmit: sip_xmit of 0x2aaad027c330 (len 881) to (null) returned -1: Invalid argument
[Jul 18 21:10:41] WARNING[3543]: chan_sip.c:3280 __sip_xmit: sip_xmit of 0x2aaad027c330 (len 881) to (null) returned -1: Invalid argument
== Using SIP RTP CoS mark 5

Steps to reproduce?

Verbose trace leading to error?

SIP transaction leading to error?

There was script changes into the dialplan and was resolved on identifying … now its working …

Can you write wha changes have you made? I have the same problem.
Thank you