12:40 AM\u00a0 09 Dec 2007
\nSeem to have figured out the strange and seemingly erratic behaviour of the Cisco 7940.<\/p>\n
Quick answer… in the SIP<mac_address>.cnf file enable NAT:
\n# NAT\/Firewall Traversal
\nnat_enable: “1”\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ; <—- default is “0”. Have no idea why this works but…
\nnat_address: “”
\nvoip_control_port: “5061”
\nstart_media_port: “19000”
\nend_media_port:\u00a0 “20000”
\nnat_received_processing: “0”<\/p>\n
I chanced on this when poring over the SIP logs. I noticed that the requests from the phone was coming from random ports. The SIP read said…
\n<— SIP read from 192.168.2.130:50218 —><\/p>\n
… but the Contact: SIp field said…
\nContact: <sip:6112@192.168.2.130:5060;transport=udp><\/p>\n
However, * responded…
\n<— Transmitting (NAT) to 192.168.2.130:50218 —>
\nSIP\/2.0 100 Trying
\nVia: SIP\/2.0\/UDP 192.168.2.130:5060;branch=z9hG4bK4fba995f;received=192.168.2.130<\/p>\n
Further down… i saw….
\n[Dec\u00a0 8 17:32:01] VERBOSE[2565] logger.c: Sending to 192.168.2.130 : 50218 (NAT)\u00a0\u00a0\u00a0 ; <—!!
\n[Dec\u00a0 8 17:32:01] VERBOSE[2565] logger.c: Using INVITE request as basis request – 0008a326-31d90005-30de60e7-48868c82@192.168.2.130
\n[Dec\u00a0 8 17:32:01] VERBOSE[2565] logger.c: Found no matching peer or user for ‘192.168.2.130:50218’<\/p>\n
wierd?? Dunno. So * was sending its reponses to the 50218 port in the above case, and obviously the phone wasn’t listening at that port! This meant that the 200 OK responses were not being received by the phone. So finally hit on this setting… didn’t make sense, but tried it coz that would be one setting that would affect source and target ports. It worked! I hope this is the last of my travails with the Cisco 7940 phone. All works fine… including the MWI! \ud83d\ude42<\/p>\n
After this the sip show peers, showed me….
\n6112\/6112\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 192.168.2.130\u00a0\u00a0\u00a0 D\u00a0\u00a0 N\u00a0\u00a0\u00a0\u00a0\u00a0 5061\u00a0\u00a0\u00a0\u00a0 Unmonitored
\n^^^^-!!! This came from the NAT\/Firewall traversal setting.
\nObviously the Phone firmware was using a random port (i.e., ignoring this setting) when used with a nat_enable: 0\u00a0 setting.<\/p>\n","protected":false},"excerpt":{"rendered":"
12:40 AM\u00a0 09 Dec 2007 Seem to have figured out the strange and seemingly erratic behaviour of the Cisco 7940. Quick answer… in the SIP<mac_address>.cnf file enable NAT: # NAT\/Firewall Traversal nat_enable: “1”\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ; <—- default is “0”. Have no idea why this works but… nat_address: “” voip_control_port: “5061” start_media_port: “19000” end_media_port:\u00a0 “20000” nat_received_processing: “0” […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[37,17,36,19,16,72],"class_list":["post-7","post","type-post","status-publish","format-standard","hentry","category-voip","tag-37","tag-asterisk","tag-cisco","tag-mwi","tag-sip","tag-voip"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/posts\/7","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/comments?post=7"}],"version-history":[{"count":3,"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/posts\/7\/revisions"}],"predecessor-version":[{"id":9,"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/posts\/7\/revisions\/9"}],"wp:attachment":[{"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/media?parent=7"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/categories?post=7"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.starprowler.com\/index.php\/wp-json\/wp\/v2\/tags?post=7"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}