Hello Michael,
I investigated this issue a little bit deeper and find out that I have sound when i place a call through sip.js demo page(http://sipjs.com/demo-phone/), so problem is not on the FS side.
Also I found next suspicious line in sip.js log: 

Tue Jun 09 2015 11:41:06 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | RTCIceChecking Timeout Triggered after 5000 micro seconds

so i decided to roll back to the previous sip.js release(version 0.6.4). Right now ICE gathering is successful:

Tue Jun 09 2015 11:45:24 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | emitting event iceCandidate
sip-0.6.4.js:2680 Tue Jun 09 2015 11:45:24 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | ICE candidate received: candidate:2704395985 1 udp 2122260223 10.1.16.7 54008 typ host generation 0
sip-0.6.4.js:2680 Tue Jun 09 2015 11:45:24 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | emitting event iceCandidate
sip-0.6.4.js:2680 Tue Jun 09 2015 11:45:24 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | ICE candidate received: candidate:2704395985 2 udp 2122260222 10.1.16.7 54009 typ host generation 0
sip-0.6.4.js:2680 Tue Jun 09 2015 11:45:24 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | emitting event iceCandidate
sip-0.6.4.js:2680 Tue Jun 09 2015 11:45:24 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | ICE candidate received: candidate:4021432865 1 tcp 1518280447 10.1.16.7 0 typ host tcptype active generation 0
sip-0.6.4.js:2680 Tue Jun 09 2015 11:45:24 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | emitting event iceCandidate
sip-0.6.4.js:2680 Tue Jun 09 2015 11:45:24 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | ICE candidate received: candidate:4021432865 2 tcp 1518280446 10.1.16.7 0 typ host tcptype active generation 0
sip-0.6.4.js:2680 Tue Jun 09 2015 11:45:26 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | emitting event iceCandidate
sip-0.6.4.js:2680 Tue Jun 09 2015 11:45:26 GMT+0300 (Финляндия (лето)) | sip.invitecontext.mediahandler | ICE Gathering Completed

, but still no sound.

Any ideas?

2015-06-04 16:14 GMT+03:00 anton vojlenko <anton.vojlenko@gmail.com>:
Hello all,
I 'm using sip.js 0.7.0 and firefox 38.0.5, with this library i can register with the freeswitch without any problem. Unfortunately after successful SIP negotiation i receive no audio call.
I have the same issue with google chrome 43.0.2357.81.

Here is full log for a problem call:
https://pastebin.freeswitch.org/24249

Who can help me with this issue?

Anton Vojlenko