On Monday 22 December 2003 19:58, Rich Adamson wrote: > > On Monday 22 December 2003 16:37, Andres wrote: > > > On Monday 22 December 2003 15:36, Rich Adamson wrote: > > > > > I have a question regarding the Asterisk Packet Time for SIP Calls. > > > > > It is hardcoded at 20ms but when I do an RTP Analysis on a stream > > > > > it is clear that these packets are not spaced out at 20ms. In > > > > > general you see something like: > > > > > > > > > > Packet 50 - Delay 50ms > > > > > Packet 51 - Delay 5ms > > > > > Packet 52 - Delay 5ms > > > > > Packet 53 - Delay 50ms > > > > > Packet 54 - Delay 5ms > > > > > Packet 55 - Delay 5ms > > > > > > > > > > Is there anyway to space them out evenly at 20ms?? > > > > > > > > The 20 ms is not the inter-packet timing, its the relative content of > > > > what's within the packet. In other words, the packet contains 20ms of > > > > encoded voice. > > > > > > > > If the inter-packet times (delays) are large, as they would seem to > > > > be in your example, then something else is not right. Possibly a > > > > half-duplex ethernet connection, something else running on the > > > > server, router buffers, etc. > > > > > > > > On a typical * --> C7960 local call, I generally see from 1ms to 20ms > > > > inter-packet delays. Seldom (if ever) anything above 20ms. > > > > > > Thanks for your Input Rich. I went ahead and tested this on our > > > production servers and sure enough the inter-packet times are 20ms. > > > There must be something happening with our LAB Asterisk. It could be > > > the CBQ traffic shaping software we have running on it. I will fiddle > > > around with it to see if it changes anything. > > > > > > Thanks! > > > Andres > > > > Ok...after some more testing, the traffic shaping software was not the > > culprit. It turns out that if the UA is configured for 60ms of voice, > > then Asterisk will show this strange behaviour. If we set the UA for > > 20ms, then all works well. > > Cool! > > How did it get set to 60ms? The GS Phone, ATA186, and SPA2000 all have a parameter that lets you set the transmit packet size to 60ms (or multiple other values). Asterisk will receive 60ms and transmit 20ms times 3 packets, andit works quite well. In any case our SPA2000 problem was unrelated to the packet time.
Regards, Andres > > > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
