sundance-communications.com/forum Forums TDM Business Telephone Systems Inter-Tel Telephones & Systems IP SLA / Fax reliability

Hi,

I had to recently upgrade the f/w in our IP SLA to 8.1.0 due to our IPRC similarly being upgraded to f/w 9.0.0. All works as before but we are only getting about a 75% success rate sending fax as opposed to 100% reliability before. Before I roll out the big guns and start looking for a QoS issues on our network, can you take a look at the following settings and see if they look right to you? The default G729 codec setting does work at all here in the UK for sending faxes!

Many thanks,
Andy

RTP Send State: OFF
RTP Receive State: OFF
Session Description: 127 (GW) 94204
Audio Stream Transmit IP Address: 192.168.5.9
Audio Stream Transmit Port: 5012
Audio Stream Receive Port: 5006
Audio Stream Transmit SSRC: 3
Audio Stream Receive SSRC: 7
Audio Frames/IP Packet: 3
Average In Time Frame Percentage Threshold: 60% for 5 seconds
RTP Profile: Inter-Tel V0
Speech Encoding Setting: G7.11 A-Law
Voice Activity Detection: DISABLED
Handset Microphone Gain: 6 dB
DTMF Encoding Setting: G7.11 A-Law
DTMF Transmit Row Level: -9 dB
DTMF Transmit Column Level: -7 dB
DTMF Receive Row Level: -9 dB
DTMF Receive Column Level: -7 dB

I dont believe that faxing over the IPSLA is officially supported so if you are getting 75% success, I would feel lucky based upon my experience. You would have to use G.711 and cross your fingers.

faxing over sla's is not supported by inter-tel though the website says they will work if you talk to sales eng or tech support they will tell you it is not supported