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The two way communication of 8220 and PSTN becomes on way

Publication Date:  2012-09-25 Views:  96 Downloads:  0
Issue Description
Networking: One 8220 and 20 PCs share local network address to access the Internet through MP800 as NAT, the communication of 8220 and new terminals is alright. It can’t hear the voice when calling PSTN, the other side can hear 8220’sound, and when 8220 play streaming media, system prompts can’t connect the host. 8220 can be normally called. 
Alarm Information
When 8220 plays streaming media, system prompts can’t connect the host
Handling Process
Open the port constringency of advanced setting in 8220, it is the same as saving two TCP ports of NAT equipment, problem is solved.
Appendix:
1. Normal call(nonconvergent port), the send and receive of media flow port state:
Audio (RTP): sending port (source port)=receiving port (listening  port)=3334
Audio (RTCP): sending port (source port)=receiving port (listening  port)=3335
Video (RTP): sending port(source)=3336; receiving port ( listening port)=10004
Video (RTCP): sending port(source)=3337; receiving port ( listening port)=10005

2. When the port is constringency, the send and receive of media flow port state:
Audio (RTP): sending port (source port)=3334; receiving port (listening  port)=3336
Audio (RTCP): sending port (source port)=3335; receiving port (listening  port)=3337
Video (RTP): sending port(source)=3336; receiving port ( listening port)=3334
Video (RTP): sending port(source)=3337; receiving port ( listening port)=3335
Root Cause
8220 can conmunicate with the new video terminal means terminal is alright, the reason one way communication may be because certain network block the audio transmission. Client use another router to access Internet, it's very normal. So locate the problem on NAT equipment, it can't create too many port.
Suggestions
None

END