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Problems sending Fax via IP phone

Hello,

we are using a fax software which sends and receives faxes by encapsulating the G711 fax protocol in IP packets.

We encounter serious issues as the remote station often cancels the fax transmission process.

I recorded a capture of the fax send process (see the link below). Without knowing anything about the details of the G711 protocol I see some TCP Dup ACK and TCP Retransmission packets in the capture. Does this indicate any kind of network problem? Or are there any other packets in the capture indicating network problems?

Capture: https://1drv.ms/u/s!AphLkdj_V9pOpiiGDXAayZqoGjOI?e=CSo9b4

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Problems sending Fax via IP phone

Hello,

we are using a fax software which sends and receives faxes by encapsulating the G711 fax protocol in IP packets.

We encounter serious issues as the remote station often cancels the fax transmission process.

I recorded a capture of the fax send process (see the link below). Without knowing anything about the details of the G711 protocol I see some TCP Dup ACK and TCP Retransmission packets in the capture. Does this indicate any kind of network problem? Or are there any other packets in the capture indicating network problems?

Capture: https://1drv.ms/u/s!AphLkdj_V9pOpiiGDXAayZqoGjOI?e=CSo9b4[removed]

Problems sending Fax via IP phone

Hello,

we are using a fax software which sends and receives faxes by encapsulating the G711 fax protocol in IP packets.

We encounter serious issues as the remote station often cancels the fax transmission process.

I recorded a capture of the fax send process (see the link below). Without knowing anything about the details of the G711 protocol I see some TCP Dup ACK and TCP Retransmission packets in the capture. Does this indicate any kind of network problem? Or are there any other packets in the capture indicating network problems?

Capture: [removed]Capture (Filtered): https://1drv.ms/u/s!AphLkdj_V9pOpil7hEJbcqKKeNxr?e=dj4RCa

Problems sending Fax via IP phone

Hello,

we are using a fax software which sends and receives faxes by encapsulating the G711 fax protocol in IP packets.

We encounter serious issues as the remote station often cancels the fax transmission process.

I recorded a capture of the fax send process (see the link below). Without knowing anything about the details of the G711 protocol I see some TCP Dup ACK and TCP Retransmission packets in the capture. Does this indicate any kind of network problem? Or are there any other packets in the capture indicating network problems?

Capture (Filtered): https://1drv.ms/u/s!AphLkdj_V9pOpil7hEJbcqKKeNxr?e=dj4RCa

EDIT: The fax sender is 192.168.73.150. It sends to the router (192.168.73.1) which acts as local registrar/gateway. For RTP, any port between 10240-11263 is used.

Problems sending Fax via IP phone

Hello,

we are using a fax software which sends and receives faxes by encapsulating the G711 fax protocol in IP packets.

We encounter serious issues as the remote station often cancels the fax transmission process.

I recorded a capture of the fax send process (see the link below). Without knowing anything about the details of the G711 protocol I see some TCP Dup ACK and TCP Retransmission packets in the capture. Does this indicate any kind of network problem? Or are there any other packets in the capture indicating network problems?

Capture (Filtered): https://1drv.ms/u/s!AphLkdj_V9pOpil7hEJbcqKKeNxr?e=dj4RCa

EDIT: The fax sender is 192.168.73.150. It sends to the router (192.168.73.1) which acts as local registrar/gateway. For RTP, any port between 10240-11263 is used.

I'm not quite sure how to figure out the RTP statistics. In RTP stream View, I see two entries between 192.168.73.150 and 192.168.73.1. One (192.168.73.1 to 192.168.73.150 port 10004) indicates a packet loss of about 3%. But the other one (192.168.73.150 192.168.73.1 port 10354) shows 0% packet loss. Isn't the one using port 10354 the actual sending stream? And isn't the main problem here Jitter not packet loss?

Problems sending Fax via IP phone

Hello,

we are using a fax software which sends and receives faxes by encapsulating the G711 fax protocol in IP packets.

We encounter serious issues as the remote station often cancels the fax transmission process.

I recorded a capture of the fax send process (see the link below). Without knowing anything about the details of the G711 protocol I see some TCP Dup ACK and TCP Retransmission packets in the capture. Does this indicate any kind of network problem? Or are there any other packets in the capture indicating network problems?

Capture Clientside (Filtered): https://1drv.ms/u/s!AphLkdj_V9pOpil7hEJbcqKKeNxr?e=dj4RCa

Capture Router/Gateway: https://1drv.ms/u/s!AphLkdj_V9pOpivieiJb8Qf3td1v?e=XpGkRj

EDIT: The fax sender is 192.168.73.150. It sends to the router (192.168.73.1) which acts as local registrar/gateway. For RTP, any port between 10240-11263 is used.

I'm not quite sure how to figure out the RTP statistics. In RTP stream View, I see two entries between 192.168.73.150 and 192.168.73.1. One (192.168.73.1 to 192.168.73.150 port 10004) indicates a packet loss of about 3%. But the other one (192.168.73.150 192.168.73.1 port 10354) shows 0% packet loss. Isn't the one using port 10354 the actual sending stream? And isn't the main problem here Jitter not packet loss?

Problems sending Fax via IP phone

Hello,

we are using a fax software which sends and receives faxes by encapsulating the G711 fax protocol in IP packets.

We encounter serious issues as the remote station often cancels the fax transmission process.

I recorded a capture of the fax send process (see the link below). Without knowing anything about the details of the G711 protocol I see some TCP Dup ACK and TCP Retransmission packets in the capture. Does this indicate any kind of network problem? Or are there any other packets in the capture indicating network problems?

Capture Clientside (Filtered): https://1drv.ms/u/s!AphLkdj_V9pOpil7hEJbcqKKeNxr?e=dj4RCa

Capture Router/Gateway: https://1drv.ms/u/s!AphLkdj_V9pOpivieiJb8Qf3td1v?e=XpGkRj

EDIT: The fax sender is 192.168.73.150. It sends to the router (192.168.73.1) which acts as local registrar/gateway. For RTP, any port between 10240-11263 is used.

I'm not quite sure how to figure out the RTP statistics. In RTP stream View, I see two entries between 192.168.73.150 and 192.168.73.1. One (192.168.73.1 to 192.168.73.150 port 10004) indicates a packet loss of about 3%. But the other one (192.168.73.150 192.168.73.1 port 10354) shows 0% packet loss. Isn't the one using port 10354 the actual sending stream? And isn't the main problem here Jitter not packet loss?

The second capture (Capture Router/Gateway) is the result of a fax sending process recorded on the gateway. The packet loss is very little (1 Packet lost). I recorded four sending processes and all look almost exactly like the one attached.

Problems sending Fax via IP phone

Hello,

we are using a fax software which sends and receives faxes by encapsulating the G711 fax protocol in IP packets.

We encounter serious issues as the remote station often cancels the fax transmission process.

I recorded a capture of the fax send process (see the link below). Without knowing anything about the details of the G711 protocol I see some TCP Dup ACK and TCP Retransmission packets in the capture. Does this indicate any kind of network problem? Or are there any other packets in the capture indicating network problems?

Capture Clientside (Filtered): https://1drv.ms/u/s!AphLkdj_V9pOpil7hEJbcqKKeNxr?e=dj4RCa

Capture Router/Gateway: https://1drv.ms/u/s!AphLkdj_V9pOpivieiJb8Qf3td1v?e=XpGkRj

EDIT: The fax sender is 192.168.73.150. It sends to the router (192.168.73.1) which acts as local registrar/gateway. For RTP, any port between 10240-11263 is used.

I'm not quite sure how to figure out the RTP statistics. In RTP stream View, I see two entries between 192.168.73.150 and 192.168.73.1. One (192.168.73.1 to 192.168.73.150 port 10004) indicates a packet loss of about 3%. But the other one (192.168.73.150 192.168.73.1 port 10354) shows 0% packet loss. Isn't the one using port 10354 the actual sending stream? And isn't the main problem here Jitter not packet loss?

The second capture (Capture Router/Gateway) is the result of a fax sending process recorded on the gateway. The packet loss is very little (1 Packet lost). I recorded four sending processes and all look almost exactly like the one attached.the same. The transmission process is always cancelled by the remote station after a short time period.