Hi, Pls try with this document. https://www.cisco.com/c/en/us/support/docs/voice/fax-modem-over-ip/20227-faxrelay-tsguide.html ... View more

The following doc would be handy and help you in future. https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/116232-technote-sbd-00.html#anc12 Pls take care of information in "Restrictions and Interactions" section. Regards... Ashok. ... View more

Hi,   Have you tried contacting ITSP (your provider) about this error? Generally, ITSP expects "Early offer (SDP in in initial invite) but in your case SDP is also there in your 1st Invite.   Regards... Ashok. ... View more

Hi,   Have you tried this? https://documentation.meraki.com/MR/Encryption_and_Authentication/Roaming_between_APs_drops_your_wireless_connection_with_802.1X_enabled   Regards.. Ashok. ... View more

Glad to hear this. Can I know what was the problem diagnosed and fix? ... View more

Ok. If the Router is still in testing mode, can you pls try with debug IP TCP packet to see whether the packets are entering the Router in the first place on 5060. If you see packets hitting the router and getting dropped, then we can think of config issue on the router. ... View more

It may be possible that the CUBE ignores SIP Bye messages if considered as malformed.   As suggested in earlier post, the best thing to do is to do SPAN monitoring through Wireshark for the traffic b/w Border and CUBE routers. If you see SIP bye packet is getting forwarded to CUBE, then they are getting dropped at CUBE itself.   https://stackoverflow.com/questions/1632499/problem-with-sip-bye-message   ... View more

Hi Kris,   Have you done debugs? Are they showing any pointers towards Toll fraud related error while registering?         ... View more

Hi,   Hope this debug was taken while trying through Softphone from Internet as I see Invite messages from the device to CME IP getting translated from 203.129.27.127 to 192.168.0.254 If this is correct, then I don't see any issues w.r.t reachability. However, I see TCP ALG error which you can fix through "ip nat service tcp port 5060".  https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/15-mt/nat-15-mt-book/nat-tcp-sip-alg.html   If the problem is still not resolved, then please share the debug "debug ccsip messages" while trying through softphone from Internet.   Regards... Ashok. ... View more

Hi, Thank you. I may be overlooked but I have not seen NAT static rule for SIP UDP/5060 port. ... View more

Hi, How did you check the port 5060 is not open from Internet? Have you tried with any other TCP port as well like 3000 as per your config to GigEth IP address?   And, can you please share "debug ip nat sip" output while trying from Softphone registration from Internet. And, if softphone is trying to register on UDP/5060 port, then you may add NAT Static translation for the same as well. Regards... Ashok. ... View more

Hi Sonam,   Pls refer to this URL. https://community.cisco.com/t5/ip-telephony-and-phones/call-history-not-displaying-on-ip-phones-ex-missed-calls/td-p/1820518   There are lots of possible issues like firmware compatibility, DHCP server change as well as Phone configuration/device pool settings change etc.   Regards... Ashok. ... View more