Cisco IP Phone Inbound Call Issues

Asterisk Asterisk SIP
1

Hello there!
I hope you guys are well.

I am facing an issue. Network Diagram is briefly explained below.

Cisco IP Phone 7940 & 7960, Softphone Eyebeam >>>>> Connected to Cisco Switch >>>> Connected to Cisco Router 3825 >>>>> Connected to ISP Modem >>>>>>>>>>> Issabel PBX on Cloud.

Eyebeam works fine. We can make and receive calls from eyebeam installed on Windows.
But we are not able to receive calls on Cisco IP phone. We can dial outbound calls but can’t receive calls.
When I dial 100 (Cisco IP Phone) from 1001 (Eyebeam) it goes to voice mail directly. I am sharing the configurations for both sip peers. Kindly suggest.

Cisco IP Phone (100)
deny=0.0.0.0/0.0.0.0
secret=fastslow521
dtmfmode=rfc2833
canreinvite=no
context=from-internal
host=dynamic
trustrpid=yes
sendrpid=no
type=friend
nat=yes
port=5060
qualify=yes
qualifyfreq=60
transport=udp
avpf=no
force_avp=no
icesupport=no
dtlsenable=no
dtlsverify=no
dtlssetup=actpass
encryption=no
callgroup=
pickupgroup=
dial=SIP/100
mailbox=100@default
permit=0.0.0.0/0.0.0.0
callerid=100 <100>
callcounter=yes
faxdetect=no

Eyebeam SoftPhone (1001)
[1001]
deny=0.0.0.0/0.0.0.0
secret=fastslow521
dtmfmode=rfc2833
canreinvite=no
context=from-internal
host=dynamic
trustrpid=yes
sendrpid=no
type=friend
nat=no
port=5060
qualify=yes
qualifyfreq=60
transport=udp
avpf=no
force_avp=no
icesupport=no
dtlsenable=no
dtlsverify=no
dtlssetup=actpass
encryption=no
callgroup=
pickupgroup=
dial=SIP/1001
mailbox=1001@default
permit=0.0.0.0/0.0.0.0
callerid=1001 <1001>
callcounter=yes
faxdetect=no

Note: If I disable nat on Cisco Phone then it does not get registered. And when I enable NAT it gets registered but can’t take inbound calls.

2

hmm the Cisco 79XX phones are only designed to connect to a local PBX
they have no support for NAT, you may have some luck with sip alg
but most installations I have seen all require having a local SIP proxy that the phones registre to

3

Thank you @TheMark but I have fixed the issue.
There NAT and NAT address option in Phone setting >>>> SIP Configuration. I have enabled NAT and given the WAN/Public address in NAT Address option. And it’s working fine. Both incoming and outgoing are working perfect.

4

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