PRI Dropping Calls | Digium TE220B

Asterisk Asterisk Support
1

I am trying to troubleshoot randomly dropped calls, but could use some guidance. I have Span 1 to the Telco and Span 2 to a legacy PBX. I don’t know how to tell which span drops the call and I have yet to find a pattern.

I am currently debugging both spans to a file, but haven’t been alerted of any dropped calls since I began debugging.

We have a PRI with TDS (which is AT&T of course). Below should be the relevant settings from the respected config files. I also have an AEX800 installed, but to keep this post short, I’m omitting those settings.

ANY guidance that could be offered would be greatly appreciated.

/etc/dahdi/system.conf:

[code]# Span 1: TE2/0/1 “T2XXP (PCI) Card 0 Span 1” (MASTER)
span=1,1,0,esf,b8zs

termtype: te

bchan=1-23
dchan=24
echocanceller=mg2,1-23

Span 2: TE2/0/2 “T2XXP (PCI) Card 0 Span 2”

span=2,2,0,esf,b8zs

termtype: te

bchan=25-47
dchan=48
echocanceller=mg2,25-47
[/code]

/etc/asterisk/dahdi-channels.conf:

[code]; Span 1: TE2/0/1 “T2XXP (PCI) Card 0 Span 1” (MASTER)
group=0,11
context=from-pstn
switchtype = national
signalling = pri_cpe
channel => 1-23
context = default
group = 63

; Span 2: TE2/0/2 "T2XXP (PCI) Card 0 Span 2"
group=0,12
context=from-pstn
switchtype = national
signalling = pri_cpe
channel => 25-47
context = default
group = 63
[/code]

/etc/asterisk/chan_dahdi.conf:

[code]#include /etc/asterisk/dahdi-channels.conf

[channels]
context = from-pstn
switchtype = national
signalling = pri_cpe
group = 0
echocancel=yes
channel => 1-23
usecallerid=yes
callerid=asreceived
facilityenable = yes
threewaycalling=yes
cancallforward=yes
useincomingcalleridondahditransfer=yes
pridialplan=unknown
prilocaldialplan=unknown
priindication = outofband
callprogress=yes
progzone=us
tonezone=0
;inbanddisconnect=yes

context = from-internal
signalling = pri_net
switchtype = national
group = 1
echocancel=yes
channel => 25-47
usecallerid=yes
callerid=asreceived
facilityenable = yes
transfer=yes
threewaycalling=yes
cancallforward=yes
useincomingcalleridondahditransfer=yes
pridialplan=unknown
prilocaldialplan=unknown
priindication = outofband
callprogress=yes
progzone=us
tonezone=0
[/code]

2

Hi

callprogress=yes set this to no and see how it is , we have seen on a couple of systems with this set to yes an issue with dropped calls.

Ian

3

Thank you Ian. I have made the change to both spans and will see if I receive any complaints today.

I appreciate you taking the time too look at the configs and respond.

4

Howdy,

We always encourage customers to contact our Support department directly for any issues with Digium products.

digium.com/support

Cheers.

5

[quote=“malcolmd”]Howdy,

We always encourage customers to contact our Support department directly for any issues with Digium products.

digium.com/support

Cheers.[/quote]

Thank you Malcom! I wasn’t sure if it was related to the Digium product or not, but I will keep that in mind should I have anymore issues. Thankfully, changing callprogress seems to have fixed it! I am not going to jump to conclusions just yet since it’s been a quiet few days, but I haven’t heard any complaints of dropped calls since making the change.

Appreciate your response!