han_sip.c:4263 __sip_reliable_xmit: Serious Network Trouble; __sip_xmit returns error for pkt data

[2018-10-26 10:21:26] ERROR[2276]: chan_sip.c:4263 __sip_reliable_xmit: Serious Network Trouble; __sip_xmit returns error for pkt data
Reliably Transmitting (no NAT) to 77.72.169.128:5060:
OPTIONS sip:77.72.169.128 SIP/2.0
Via: SIP/2.0/UDP 192.168.2.134:5060;branch=z9hG4bK333f536a
Max-Forwards: 70
From: “asterisk” sip:[email protected];tag=as683c8a7c
To: sip:77.72.169.128
Contact: sip:[email protected]:5060
Call-ID: [email protected]:5060
CSeq: 102 OPTIONS
User-Agent: Asterisk PBX 13.12.1
Date: Fri, 26 Oct 2018 14:21:26 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0

In chan_sip, a “__sip_reliable_xmit: Serious Network Trouble; __sip_xmit returns error” error typically means that there’s a misconfiguration on the IP addressing on your system. Asterisk is trying to send a SIP message, and passes the network packet to the operating system, and the operating system says “Whoa there buddy, that’s not right”.

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