VOIP Handset woes
Have a Comcast business account with 50Mbps/10Mbps service using CISCO DPC3939B Gateway. Not using Comcast's VOIP XFINITY service.
VOIP Handset and PC are hardwired to amped|wireless AC750 Range Extender TAP-EX2 configured to use dual band.
VOIP handset drops calls. On one instance, call was dropped and couldn't get dialtone without rebooting the AC750. Before reboot, the 5GHz signal was at 0% (per AC750 panel display) whereas the 2.4GHz signal was at 97%. I'm not sure of the relevance since the AC750 is configured to route hardwired connections through the 2.4GHz connection.
Wanting to know best practices for configuring the AC750 and CISCO DPC3939B for VOIP. Also, whether AC750 is a satisfactory choice: I need a wireless connection between (a) the pc and VOIP handset and (b) the Gateway.
I don't see QoS settings on the AC750 nor in user manual for the Gateway. I also saw a post here saying that known problems with CISCO DPC3939B Gateway include:
Any thoughts on that?
Is resolving the dropped VOIP calls likely going to chew up a lot of time diagnosing and might it be better to subscribe to Comcast's VOIP/XFinity -- although it seems I would still have the need for a wireless hop between the handset and the Gateway's Line 1/2 ports...?
Appreciate any help -- thanks.
edit: Seems Comcast's VOIP/Xfinity is for use with analog handsets...
VOIP Handset and PC are hardwired to amped|wireless AC750 Range Extender TAP-EX2 configured to use dual band.
VOIP handset drops calls. On one instance, call was dropped and couldn't get dialtone without rebooting the AC750. Before reboot, the 5GHz signal was at 0% (per AC750 panel display) whereas the 2.4GHz signal was at 97%. I'm not sure of the relevance since the AC750 is configured to route hardwired connections through the 2.4GHz connection.
Wanting to know best practices for configuring the AC750 and CISCO DPC3939B for VOIP. Also, whether AC750 is a satisfactory choice: I need a wireless connection between (a) the pc and VOIP handset and (b) the Gateway.
I don't see QoS settings on the AC750 nor in user manual for the Gateway. I also saw a post here saying that known problems with CISCO DPC3939B Gateway include:
SIP ALG is enabled by default and cannot be disabled, causing intermittent phone call and feature failures.
Any thoughts on that?
Is resolving the dropped VOIP calls likely going to chew up a lot of time diagnosing and might it be better to subscribe to Comcast's VOIP/XFinity -- although it seems I would still have the need for a wireless hop between the handset and the Gateway's Line 1/2 ports...?
Appreciate any help -- thanks.
edit: Seems Comcast's VOIP/Xfinity is for use with analog handsets...
Last Comment
ASKER
Do you have qos set on the ac750 to prioritize VoIP traffic, did you disable sip related features on the ac750I don't see QoS or SIP settings on the AC750
see if [the Cisco Gateway] can be configured in a bridge mode meaning it will be the end point on the coax feed, but all handling will be passed to the ac750
Can you 'dumb that down' for me?
ASKER
I found this link re: bridge mode. How might this help?
The cisco gas sip alg enabled by default and can not be changed, Cisco in bridging mode if available will /should remove the sip alg part is it will not be handling routing/nating.
I believe on the ac750 dip alg is disabled by disabling sip passthrough on the same page where you have enable VPN, IPSec, passthrough.
Check with xfinity on whether you can set the device if rented to bridging mode.
I believe on the ac750 dip alg is disabled by disabling sip passthrough on the same page where you have enable VPN, IPSec, passthrough.
Check with xfinity on whether you can set the device if rented to bridging mode.
In bridging mode traffic pass over the Cisco device to the ac750 without any additional interaction after the signal from the coaxial feed is converted to Ethernet traveling over the bridge terminating on the ac750 whose WAN port will now reflect the public IP assign/subscribed by Comcast.
Versus currently your ax750 wan port has a 10.x.x.x or another private IP range.
Versus currently your ax750 wan port has a 10.x.x.x or another private IP range.
ASKER
thanks-
If I put the Gateway in bridge mode, will this disable the dual-band wireless component of the Gateway too?
I believe on the ac750 dip alg is disabled by disabling sip passthrough on the same page where you have enable VPN, IPSec, passthrough.I don't believe this device has configs for vpn, IPSec, QoS, voip... (User Giude)
If I put the Gateway in bridge mode, will this disable the dual-band wireless component of the Gateway too?
You mentioned it, but I seemed to have overlooked such that I took as though you have two routers. You are using ac750 range extender which does not have the routing option/functionality that is needed to place Cisco into bridging mode. Check with Comcast to see which routers they have to offer in your area and see if one of the others has the option to disable sip alg.
Sip alg has an effect on VoIP calls.
Sip alg has an effect on VoIP calls.
ASKER
Thanks arnold. Is there a way to confirm that the Comcast Gateway's Sip alg is causing the problems, e.g. maybe the range extender's logs or some other tools?
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ASKER
Thanks arnold
Wireless Networking
Wireless networking is anything related to the transfer of data between two (or more) devices without the use of a physical connection, ranging from getting advice on a new Bluetooth headset to configuring sophisticated enterprise level networks.
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It sounds as though your setup is double nat, the Cisco natting to ac750 natting to phone.
Look at replacing the Cisco or see if it can be configured in a bridge mode meaning it will be the end point on the coax feed, but all handling will be passed to the ac750 ....