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Issue : SIP Trunk DownIn our CUCM showing SIP trunk down ,SIP trunk is between CUCM and Microsoft Team . I found in TCP out of order in Packet Capture . Is this problem is in firewall or CUCM or Microsoft Team ? SIP Trunk Microsoft Team CUCM
After I change the link from Satellite link to MPLS L2 VPN between HQ and remote site , I got more bandwidth ,even though I have got outlook disconnect error.I am finding the root cause in Firewall, exchange server, and client PC. I can't decide the...
Dear Sir,
I have encountered the https web site slow problem , acutally totally can't not see any data on https website. I have got one capture file from my load balancer , I found that so many TCP out-of-order.
I am not sure it is relate with my iss...
Dear Sir,
I cannot login to cisco jabber from outside of our corporate network. I got following message ( Please see in attached file ). How can I check.
Public IP address is reachable and can ping , traceroute also complete.
Dear Sir,
I am using two Polycom Devices , models are Group 500 and Debut . These devices are under Cisco ASA 5525 Firewall. There is no error with Group 500 . But when I use Debut calling, video call is automatically drop in exactly every 5 minute...
I solved the SIP trunk and then call signaling is ok.But when I pick up phone cannot hear the voice (RTP) . In my experience, firewall NAT cannot handle the RTP every time I have to exclude firewall NAT for phone to phone (RTP).It is able to do for l...
Dear All,
I have got solution. It is happening on MTU size. Because of I only got MTU 1450 on new link . I have discussed with ISP , after that I got 1472 and issue was solved.
If you face same issue you can also try this scenario.
Cheer !!
I am using Cisco Products in end to end but except Firewall and I don't know which product are using in ISP. I am not sure where can I get assist. So, I arrive to this Email security blog.
I am suspecting MTU size on Link or exchange server issue ....
Issue was sovled . I found that MTU size error . When SIP add credential infomation MTU size is bigger and used UDP , so , MPLS L2 VPN link not able to carry. I found UDP fragement in Packet Capture. So, I change UDP to TCP for initiate in Voice Gate...
