Hi I think it is not the right place to ask these question better post on asterisk technical list
Sent from my iPhone On 09-Mar-2013, at 17:32, Rifat Rahman <[email protected]> wrote: > Hello there, > > I have built a kernel module that is responsible for sip and rtp > encryption/decryption, padding/depadding, ptime decrease (splitting a > large rtp packet to splitting into smaller packets of ptime 20) for > incoming packets and ptime increase (merging small rtp packets into a > big rtp packet of desired ptime) for outgoing packets. This is meant > to be a faster process and indeed it is. The whole purpose is to > taking the load from the sip server and to manage this things in > kernel space. > > Now my problem is that, when packets are splitted in kernel space, no > harm is done. But when packets are merged, i see somehow large zitter > and delta that makes the voice robotic. I am quite new to this line. > So from my experience I can say nothing on which side it is the > problem. I carefully observed RTP sequencing and timestamping, and > yes, it is handled perfectly. To have a work around, I suspect the > following things: > > 1. The zitter control might be the problem. But on which side I should > concentrate? Should I look the client's zitter buffer handling or > server side zitter buffer handling? > > 2. If asterisk is run from a RT (real time) kernel, should it make any > problem? Or, is it necessary to run asterisk from an RT kernel to > mitigate my issue? > > 3. If both RT kernel and zitter control mechanism is taken to the > asterisk server, can I hope to solve this problem? > > I am in doubt whether the process gets somehow expensive while ptime > increase. Because I have to drop a few packets, making lists of > packets referring to a communication, and etc. etc. I am running out > of ideas. Because debugging in kernel space is not easy. > > -- > Rifat Rahman > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-biz mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-biz -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
