Two routers, two physical telco lines, one network - is it possible to double the bandwidth without IP address collosions?

We currently have two physical incoming telco lines - one VOIP and one currently ISDN.  The VOIP line is currently being used for all data traffic.  The latter is now being "force" converted to VOIP by the telco provider, and I was advised we would need a second router for this telco line.

My question is, whether it is possible to double the bandwidth by running data traffic over both lines (no specific requirement as to what traffic runs over which telco line) in parallel?  Most likely there would be problems with colliding  IP addresses - default gateway and any other IP addresses utilized by the routers themselves.  I imagine there are routers capable of addressing two incoming telco lines, but how expensive would one be im comparison to two separate commonly available routers?

Any suggestions would be appreciated.  The other posts on this topic all address a different scenario.
an6543Asked:
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Andy BartkiewiczNetwork AnalystCommented:
Well the short answer is no. In order to create a port channel, you ISP would need to configure it on their side as well. This is not going to be possible, even if they would do it, which a doubt, your two circuits are different types of technology so its not going to work. You could set both connections as default gateways, then your router will use both connections. If you do this you will probably see some improvement but it wont be double the speed. You are better off cancelling both of your current connections and going with one faster connection.
CompProbSolvCommented:
There are many routers that will allow two ethernet WAN connections and either share them or use one as primary and the other as failover.  For example, the Cisco RV042 is an inexpensive ($150-200) one that will do this: https://www.cisco.com/c/en/us/products/routers/rv042-dual-wan-vpn-router/index.html .

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Aaron TomoskyDirector of Solutions ConsultingCommented:
if you use a traditional router, you can round robin some traffic, but things like HTTPS have to be set as "sticky sessions" at a minimum to keep a single flow on a single link. Something smarter like an SD-WAN edge router can manage these connections much more effectively. My day job is at a velocloud implementation and support specialist and our gear does this very very well. VeloCloud specifically does per-packet virtualization so a single flow (ftp session, speedtest, backup, etc...) can span multiple links.

Depending on your link speeds, managed sdwan is usually $100-$200/site/month, so a bit more than an RV042, but similar to the TCO of a sonicwall/fortinet/paloalto/etc...
an6543Author Commented:
Cisco RV042 or something similar appears to be the best solution - cost effective and no issues with IP address conflicts.
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