Fax from location X to location X - Internal fax fails, external successful

[VoipX]

When I send a fax from a fax machine located in location 3 (station 1505) to a fax machine located in location 4 (station 1460) it hangs up after the first page or fails before even sending the first page.
These same fax machines are able to successfully send faxes to external fax numbers with no issues at all. Both fax machines are on analog ports on their respective G450 gateways.
Location 3 is in ip-network-region 3 and location 4 is in ip-network-region 4. Both network regions are using the same ip-codecs (set #2) which are as follows.

IP Codec Set

Codec Set: 2

Audio Silence Frames Packet
Codec Suppression Per Pkt Size(ms)
1: G.729 n 2 20
2: G.711MU n 2 20
3:
4:
5:
6:
7:


Media Encryption
1: none
2:
3:

IP Codec Set

Allow Direct-IP Multimedia? n



Mode Redundancy
FAX t.38-standard 0
Modem off 0
TDD/TTY US 3
Clear-channel n 0


I have tried to change the ip-codec set on both network regions to ip-codec set 7 which is as follows:

IP Codec Set

Codec Set: 7

Audio Silence Frames Packet
Codec Suppression Per Pkt Size(ms)
1: G.711MU n 2 20
2:
3:
4:
5:
6:
7:


Media Encryption
1: none
2:
3:


IP Codec Set

Allow Direct-IP Multimedia? n



Mode Redundancy
FAX t.38-standard 0
Modem off 0
TDD/TTY US 3
Clear-channel n 0


When I do a list trace on the far end (station 1460) while sending a fax from station 1505 I get the following:

LIST TRACE STATION 1460

time data

10:42:13 Calling party trunk-group 3 member 1 cid 0x1fbc
10:42:13 Calling Number & Name xxxxxx1505 NO-CPName
10:42:13 dial 1460
10:42:13 ring station 1460 cid 0x1fbc
10:42:29 active station 1460 cid 0x1fbc
10:42:32 Start Fax Relay aux:none tone:CED (igc) uid:0x8c80
From voip: [10.10.47.3]:2054
10:42:32 Start Fax Relay aux:none tone:none (igc) uid:0x53e00
From voip: [10.10.41.22]:2932
10:43:16 idle trunk-group 3 member 1 cid 0x1fbc
10:43:42 TRACE COMPLETE station 1460 cid 0x0

Neither of the ip-network-regions are set to use Relay for fax, in fact none of the ip-network-regions are. 10.10.47.3 exists in ip-network-region 4, while 10.10.41.22 does not exist in any ip-network-region according to the settings on the ip-network-map page. If an ip-address is not part of any ip-network-region according to the ip-network-map, then what settings does it use?

Can someone please provide some more clarity on how this fax is seeming to go over the internal network through ip-network-regions and how it chooses its path. As I stated above all external faxes to any other business are successful. What am I missing here? Why is it showing relay for the fax on the list trace? I also tried to setup a new ip-codec and change the settings on both ip-network-region pages to use the new codec between one another, but it seems that they are not using either as it says fax relay. Any clarity or suggestions would be much appreciated. Thanks in advance.

 

[VoipX]

When I do a list trace on station 1505 while sending a fax from station 1505 to station 1460 I get the following:

LIST TRACE

time data

11:18:55 active station 1505 cid 0x21fa
11:18:57 dial 9xxxxxx route:ARS
11:18:57 term trunk-group 3 cid 0x21fa
11:18:58 xoip options: fax:Relay modemff tty:US (igc)
xoip ip: [10.10.51.3]:2062
11:18:58 xoip options: fax:Relay modemff tty:US (igc)
xoip ip: [10.10.41.21]:3140
11:18:58 G729 ssff ps:20 - IGC created
rgn:11 [10.10.51.3]:2062 (GW11)
rgn:1 [10.10.41.21]:3140 (PN1)
11:18:58 dial 9xxxxxx1460 route:ARS
11:18:58 route-pattern 105 preference 1 location 3 cid 0x21fa
11:18:58 seize trunk-group 3 member 19 cid 0x21fa
11:18:58 Setup digits xxxxxx1460
11:18:58 Calling Number & Name xxxxxx1505 FBCL PIO Fax
11:18:58 Proceed trunk-group 3 member 19 cid 0x21fa
11:18:58 Alert trunk-group 3 member 19 cid 0x21fa
11:19:05 Start Fax Relay aux:none tone:CNG (igc) uid:0x8c2f
From voip: [10.10.51.3]:2062
11:19:05 Start Fax Relay aux:none tone:none (igc) uid:0x53e12
From voip: [10.10.41.21]:3140
11:19:14 active trunk-group 3 member 19 cid 0x21fa
11:20:09 idle station 1505 cid 0x21fa
11:20:14 TRACE COMPLETE station 1505 cid 0x0


The fax seems to go through fine but only like once every 10 times we test it. The list trace results are the same when it is successful and when it is unsuccessful.

 

[VoipX]

The G.729 Codec was the issue. Once this was changed everything worked just fine.

 

[fataldata]

You might be able to get it working with G.729 if you changed your Fax treatment to Pass Through.

                         IP Codec Set

                              Allow Direct-IP Multimedia? n


                    Mode               Redundancy
    FAX             pass-through        1
    Modem           pass-through        1
    TDD/TTY         US                  3
    Clear-channel   n                   0

 

[VoipX]

It still is not working, I will try this. It is only site to site that is not working. Why is it not acting as if its going out over the trunks? How does an analog station decide which location it is part of? What if I want to route this one machine over a pass-through codec and everything else over the t.38? The only way I can think to do this would be to add an ARS route using an extra digit and then delete the digit in the route pattern, for example 99-123-456-789 and then have the route pattern delete 1 digit to delete the extra 9. Any suggestions? I am going to try the pass-through and see what I get.

 

[VoipX]

I meant to route it over a different trunk. I still would like to know how to use a separate IP-Network-Region and location for a single analog station, or how it chooses which one to use to begin with as it is not part of an IP-network-map. I guess it would use the region of the gateway it exists on? Doesn't seem to be but this makes the most sense to me.