one way audio with RTP312 in Hyderabad(CitiCable)

Posts: 4 · New Forum Member Joined: Dec 28, 2005 Posts: 4

I am getting only one way audio on the Vonage phone. It is the same whether I initiate the call(from phone connected to Vonage RTP312) or I receive the call (from a PSTN phone in US)

I can hear audio from US PSTN phone, but they cannot hear audio from Vonage phone in Secunderabad

My Setup:
CitiCable Broadband in Secunderabad. (I see only a ethernet cable into my parents house, no cable modem at home, presumably it is not a PPPoE)

Ethernet cable staright into RTP312 WAN port

COnfigured ISP provided static IP address (172.20.25.x) on RTP312 and using 192.168.15.x for laptop, desktop internal network with DHCP on RTP312

Debug so far:
- Vonage speecdcheck says download is 40kbps and upload is ???
- All the forum discussion talked bout DSL and PPPoE.
- testyourvoip.com failed as 5060 is owned by RTP312 and testyourvoip.com cannot reach my PC.(Will remove RTP312 and try again to see if ISP/port blocking/NAT traversal is the issue.)
- Used Vonage bandwidth saver to lower bandwidth requirement, no resolution of the issue

Questions:
- ANyone using CitiCable with Vonage?
- Is the download speed too low?
- Is CitiCable upload speed too low?

Thanks
- V

Posts: 4777 · Vonage Forum **MVM** Joined: Aug 30, 2005 Posts: 4777

Yes, that download speed is ridiculously low for Vonage. Are you sure it's right? Your idea about removing the adapter and re-trying the test call is excellent. Do the same with the upload and download speeds.

Posts: 4 · New Forum Member Joined: Dec 28, 2005 Posts: 4

Used Bandwidth saver to lower requirement and now SJ party can make out that I am speaking, but still too choppy to make out the actual words:-)

Tried testyourvoip again with G729 and G711.
(Still via RTP312)

Packet Loss seems to be the culprit! This explains why I can hear SJ party pretty well, but they cannot hear me at all.

With G729
From San Jose to Hyd 0% packet loss
From Hyd to San Jose 40% packet loss.

With G711
From San Jose to Hyd 20% packet loss
From Hyd to San Jose 60% packet loss.

Talked to CitiCable guy. He says download speed is max 64kbps and upload speed is lower. Looks like I need to switch ISP. Checking with BSNL.

--------- From You TO San Jose -----------------
Media Quality MOS 1.0 / 5.0
(Best with G.729 is 4.2)

Degradation Sources
Codec 0.81 20.4%
Latency 1.07 26.7%
Packet Discards 0.54 13.4%
Packet Loss 1.57 39.3%

Codec G.729 (CS-ACELP at 8kbps,
10ms RTP payload,
40kbps IP BW)
Round-Trip
Latency 2558 ms
Packet Discards 11.1%
Packet Loss 32.4%
Loss Periods Min: 10 ms
Avg: 10 ms
Max: 240 ms
Burst Loss

Jitter Min: 0 ms
Avg: 18 ms
Max: 410 ms

Signaling Quality Post-Dial Delay 1502 ms
Call Setup Time 1572 ms
Media Delay 2083 ms
MOS Analysis FROM San Jose To You

Media Quality MOS 1.9 / 5.0
(Best with G.729 is 4.2)

-------- From San Jose TO you --------------
Degradation Sources
Codec 0.97 31.8%
Latency 1.78 58.0%
Packet Discards 0.31 10.2%
Packet Loss 0.00 0.0%

Codec G.729 (CS-ACELP at 8kbps,
10ms RTP payload,
40kbps IP BW)
Round-Trip
Latency 2558 ms
Packet Discards 1.5%
Packet Loss 0.0%
Loss Periods Min: 10 ms
Avg: 20 ms
Max: 70 ms
Burst Loss

Jitter Min: 0 ms
Avg: 6 ms
Max: 70 ms

Signaling Quality Post-Pickup Delay 1766 ms
Call Setup Time 1592 ms
Media Delay 1800 ms

Posts: 4777 · Vonage Forum **MVM** Joined: Aug 30, 2005 Posts: 4777

I think you've made the right diagnosis.