sundance-communications.com/forum Forums TDM Business Telephone Systems Samsung Telephones & Systems SPNet Stopped Working

I have a 4 site network using SPNet over VPN on Windstream-type MPLS. Three OS100's and the hub is a OS500 with SVMi-8E. All three nodes have their own trunks and send callers to Menu in SVMi over SPNet. This has been in place for 6 years and working fine. First with Paetec and now Windstream. The OS500 started having an intermittent problem intercoming the other sites about 2 months ago. The 100's can call the 500 fine and call each other with no problems. When the calls fail you see the extension you dialed in the display, no ring-back tone and after about 4 ro 5 seconds the message "out of order". This is only when the OS500 initiates the intercom call. The customer has been installing FatPipe routers on all sites but claims these are transparent for our IP's. WireShark traces do not show any excessive latency when this occurrs. Any ideas? Thanks.

Out of order means that the MP cards can't talk to each other within the timeout period (couple of seconds, not sure what the exact time is).

What are these new routers for? Since they are the only thing that has changed i would start with these, have they mucked up the ACL's on them perhaps?

The Fatpipe routers are used to optomise the customers T-1's. They have the Windstream MPLS and an Internet circuit on all 4 sites. The Fatpipe allows un-used bandwidth to be utilized when large amounts of data are being transfered between the sites. What are ACL's?

Hey Tom
ACL
Access control list used for the audio on voip calls make sure port 6100 and 9000 are open for the samsung. if you have access to the router setu
Sp a tcpdump of the wan port and run it until the call fails stop the tcpdump and off load the file to your pc run wire shark and open the file. in wireshark enter UDP in the filter and check the stream for a blocked or failed response in the RTP port range and the 6100 port range. I think 6100 is the signal port to setup the call in the samsung then it's handed off to the RTP port range. if it works sporadically or dies when real busy the whole RTP range is most likely not open. the Samsung manual will give you range the RTP port in a range between 16384 and 32767
Normally, one call uses one SIP port (for the signalling) and one RTP port (for the audio). An audio call uses three ports: SIP+RTP.
If the 500 site is using Ethernet to the WAN port on the router bypass it with a small switch in front of the router plug the idcs500 into the switch plug the router into the switch plug the feed Ethernet into the switch. if it works then the other guy needs to fix his sh*t
Bob R milford

Thank both of you, Nameless and Bobsoldjunk, for your imput. It has helped me get a little farther down the road to understanding SPNet on the Samsung and what is and isn't my problem.